Name: Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 8 ounces medium-size shell pasta; 2 ribs celery, diced; 1/4 cup onion, diced; 3/4 cup frozen peas; 1 clove garlic, minced; 5 Tablespoons butter, divided; 5 Tablespoons all-purpose flour; 2 cups low-sodium chicken broth; 1 cup milk, warmed; 1/2 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 1/8 teaspoon dried dill weed; 2 teaspoons fresh lemon juice, more if desired; 2 Tablespoons fresh chopped parsley, minced; 1 cup freshly grated parmesan cheese, divided; 5 ounces canned albacore white tuna, packed in water, or more if desired; 1/2 cup Ritz crackers, crushed; 1 Tablespoon butter, melted

I absolutely love sharing this Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe with friends and family because it feels like a warm hug on a plate. This dish brings together tender pasta shells, succulent tuna, and vibrant veggies all enveloped in a luscious, cheesy sauce. The crispy, buttery Ritz cracker topping adds that perfect golden crunch that keeps me coming back for seconds every time. It’s one of those comforting casseroles that’s as nostalgic as it is delicious, and I’m excited to walk you through every step so you can enjoy it exactly the way I do.

Why You'll Love This Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe

What really captivates me about this recipe is the harmony of flavors and textures. The creamy, cheesy sauce balances beautifully with the fresh brightness from lemon juice and parsley, while the tender peas and aromatic celery add a delicate crunch inside. Then, that buttery Ritz cracker topping with freshly grated Parmesan delivers a golden crust that gives each bite a wonderfully crispy finish. I find that combination makes every spoonful a new delight and keeps the dish from ever feeling heavy or dull.

Besides its amazing taste, I love how approachable this casserole is to make. It doesn’t demand a bunch of fancy ingredients or complicated steps – just simple staples you probably have on hand. Plus, it’s a fantastic weeknight dinner or potluck showstopper because you can prep much of it ahead of time and pop it in the oven when ready. I’ve served it for casual family dinners, holiday gatherings, and even to impress unexpected guests, and it always steals the spotlight.

Ingredients You'll Need

The image shows two cooking pans side by side on a white marbled surface. The left pan contains three layers of food: a bottom layer of sautéed small chopped white onions, a middle layer of bright green peas, and a top layer of diced celery, all mixed together with a brown wooden spatula. The right pan shows a creamy white sauce base with grated white cheese and fresh green herbs like chopped parsley and dried dill spread on the surface, while a woman's hand squeezes half a lemon over the mixture, adding a bright yellow color in the top area. photo taken with an iphone --ar 4:5 --v 7

These ingredients are straightforward but each plays a crucial role in building layers of flavor, texture, and color in this casserole. From the tender pasta to fresh parsley and Parmesan, every component adds something special.

Medium-size shell pasta (8 ounces): Holds the creamy sauce perfectly and offers a satisfying bite.
Butter (5 tablespoons, divided): Used for sautéing and adding richness throughout the dish and topping.

Celery (2 ribs, diced): Adds crunch and a subtle fresh flavor.
Onion (¼ cup, diced): Brings subtle sweetness and depth to the sauce.
Frozen peas (¾ cup): Pop of color and mild sweetness.

Garlic (1 clove, minced): Adds inviting aroma and savory punch.
All-purpose flour (5 tablespoons): Thickens the creamy sauce just right.
Low-sodium chicken broth (2 cups): Provides savory liquid base without overpowering.

Milk (1 cup, warmed): Creates creamy texture in the sauce.
Kosher salt (½ teaspoon): Enhances all the flavors subtly.
Freshly ground black pepper (¼ teaspoon): Adds slight warmth and complexity.
Dried dill weed (⅛ teaspoon): Gives a gentle herbaceous note complementing the tuna.

Fresh lemon juice (2 teaspoons, or more): Brightens and balances the richness beautifully.
Fresh chopped parsley (2 tablespoons, minced): Adds freshness and vibrant color.
Freshly grated Parmesan cheese (1 cup, divided): Essential for cheesy depth inside and topping.

Canned albacore white tuna (5 ounces, or more): The star protein that makes this casserole hearty and satisfying.
Ritz crackers (½ cup, crushed): Creates the irresistible golden crunchy topping.
Butter (1 tablespoon, melted): Binds the cracker topping and infuses richness.

Directions

Step 1: Begin by cooking your pasta shells just until al dente according to the package instructions. You want them tender but still firm enough to hold their shape after baking. Once cooked, drain and set aside.

Step 2: In a large skillet, melt 1 tablespoon of butter over medium heat. Add the diced celery, onion, peas, and minced garlic, then sauté until the vegetables are softened and fragrant, about 3 to 5 minutes. Once done, transfer these veggies to a bowl and set aside.

Step 3: Using the same skillet, add the remaining 3 tablespoons of butter. Once melted, whisk in the flour and cook for 1 full minute to form a roux, stirring constantly to avoid lumps. Next, gradually whisk in the warm chicken broth and milk, ensuring a smooth sauce. Bring this to a simmer while stirring, and watch it thicken slightly. Lower the heat and season with salt, dill, lemon juice, parsley, and half of the Parmesan cheese. Taste your sauce and adjust seasoning if needed – this step really lets you perfect the flavor.

Step 4: Remove the sauce from heat, then stir in the cooked pasta, sautéed vegetables, and canned tuna gently to combine everything evenly. Pour this mixture into a 9x13-inch baking dish, spreading it out evenly. Sprinkle the remaining Parmesan cheese over the top for that lovely cheesy layer.

Step 5: Prepare the topping by crushing the Ritz crackers in a bowl. Add the melted butter and mix until the crumbs are evenly coated. Sprinkle this mixture generously across the casserole’s surface to create that signature crispy, buttery crust.

Step 6: Bake your casserole in a preheated 350°F oven for 25 to 30 minutes or until the topping turns golden and the casserole is bubbling around the edges. Once out of the oven, let it rest for a few minutes to set before serving.

Servings and Timing

This Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe yields about 6 hearty servings, perfect for a family dinner or small gathering. The prep time usually takes me around 20 minutes, mainly for chopping veggies and preparing the sauce. Baking requires approximately 25 to 30 minutes. Altogether, you should budget about 55 minutes from start to finish. I recommend letting the casserole rest for 5 to 10 minutes after baking to allow the flavors to meld and make serving easier.

How to Serve This Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe

The image shows two views of a pasta dish. On the left side, a bowl with light yellow shell pasta mixed with green peas, small chunks of light pink chicken, and chopped light green celery and white onions. The ingredients sit on a creamy sauce visible between the pasta and vegetables, with a wooden spoon lifting some pasta from the bowl. On the right side, a white rectangular baking dish filled with the mixed pasta and vegetable ingredients, topped with a golden brown crumb layer, showing a mix of crispy breadcrumbs and small nut pieces, scattered lightly around the dish on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

When I serve this casserole, I love pairing it with a crisp green salad tossed in a light vinaigrette to balance the richness of the dish. Roasted or steamed seasonal vegetables like asparagus, broccoli, or green beans complement it beautifully by adding freshness and contrasting textures.

For presentation, a sprinkle of freshly chopped parsley or additional grated Parmesan right before serving brightens the plate and adds flair. I usually cut the casserole into individual squares and serve on warmed plates to keep each portion cozy and comforting. This recipe shines best when served hot or warm, right out of the oven, so everyone can enjoy that crunchy topping and creamy layers at their best.

Beverage-wise, I often reach for a chilled glass of crisp white wine like Sauvignon Blanc or Pinot Grigio, which cuts through the dish’s richness. Non-alcoholic options like sparkling water with a wedge of lemon or a refreshing iced tea also work wonderfully. This casserole is equally perfect for weeknight family dinners, potluck parties, or casual holiday meals where you want something both simple and impressive.

Variations

I love experimenting with this recipe to suit different tastes and dietary needs. For example, if you prefer a gluten-free version, swapping the all-purpose flour for a gluten-free blend and using gluten-free pasta and crackers works wonderfully without sacrificing flavor or texture. For those avoiding dairy, try substituting milk with unsweetened almond or oat milk and use vegan butter alongside nutritional yeast instead of Parmesan to maintain that cheesy vibe.

If you want to amp up the flavors, consider adding sautéed mushrooms, chopped bell peppers, or even a sprinkle of smoked paprika for a smoky twist. You could also swap the tuna for cooked shredded chicken or canned salmon to switch up the protein. To mix things up on the cooking method, preparing this as a stovetop casserole (then finishing under the broiler for the topping) lets you speed up the process and still get that perfect crunchy crust.

Storage and Reheating

Storing Leftovers

I store leftover casserole in an airtight container once it has cooled to room temperature. It will keep beautifully in the refrigerator for up to 5 days. Using glass or BPA-free plastic containers with secure lids helps maintain freshness and flavor. Make sure to label the container with the date so you don’t forget its shelf life.

Freezing

This casserole freezes well if you want to save portions for later. Freeze it in individual or family-sized airtight containers or foil pans wrapped tightly in plastic wrap and foil. For best quality, consume within 2 to 3 months. Thaw overnight in the refrigerator before reheating to retain the creamy texture and topping crunch.

Reheating

When reheating, I prefer doing so in the oven at 350°F for 20 to 25 minutes until warmed through and the topping revives its crispiness. Cover with foil during the first 10 minutes to avoid over-browning, then remove foil to finish crisping the Ritz cracker crust. You can also reheat single servings in the microwave on medium power, but I find the topping loses some crunch this way, so the oven is my go-to.

FAQs

Can I use a different type of pasta for this casserole?

Absolutely! While medium shell pasta is great for holding the sauce, you can also use elbow macaroni, rotini, or penne. Just make sure to cook the pasta al dente so it doesn’t become mushy after baking.

Is it necessary to use canned tuna packed in water?

Using tuna packed in water keeps the casserole light and prevents excess oiliness. However, if you prefer, you can use tuna packed in oil for a richer flavor - just reduce the added butter slightly to balance the fat.

Can I make this casserole ahead of time?

Yes! I often prepare the casserole fully assembled and keep it covered in the fridge for up to a day before baking. This makes it perfect for busy days or entertaining, just add an extra 5-10 minutes to the baking time if taken straight from the fridge.

What can I use instead of Ritz crackers for the topping?

If you don’t have Ritz crackers on hand, crushed buttery breadcrumbs or panko mixed with melted butter work beautifully as a crunchy topping alternative. You can even add a pinch of garlic powder or Parmesan for added flavor.

Can I add more vegetables to make it healthier?

Definitely! Feel free to add finely chopped carrots, mushrooms, or spinach to boost the veggie content. Just sauté them along with the other vegetables to ensure they’re tender before combining in the casserole.

Conclusion

I hope this Creamy Tuna Pasta Casserole with Parmesan and Ritz Cracker Topping Recipe inspires you to create a cozy meal that feels both nostalgic and fresh. It’s one of those recipes I keep coming back to because of its comforting flavors, simplicity, and that irresistible crunchy topping. Whether you’re cooking for family, friends, or just yourself, this dish is sure to bring warmth and smiles around the table. Give it a try—I promise it will become a favorite in your recipe collection!