This 5-Ingredient Oven Baked Tuna Rotini is the kind of practical casserole that earns a permanent place in a busy weeknight rotation. It leans on pantry staples, uses the liquid from the tuna to help flavor the dish, and turns dry rotini into a creamy, baked pasta dinner with almost no hands-on work. It also echoes the classic appeal of tuna noodle casseroles, but with a simplified method that skips extra pots and makes cleanup especially easy.
Serve this with a crisp green salad, simple steamed broccoli, or green beans to balance the richness of the pasta. A little garlic bread or buttered toast works well for scooping up the creamy sauce, and if you want something bright on the table, sliced tomatoes or cucumber salad add a fresh contrast.
5-Ingredient Oven Baked Tuna Rotini
Servings: 6
Ingredients
12 ounces dry uncooked rotini
2 cans undrained chunk white tuna, about 5 ounces each
1 can condensed cream of mushroom soup, 10.5 ounces
2 cups milk
1 cup grated Parmesan cheese
Directions
1. Preheat the oven to 400°F and lightly grease a 9-by-13-inch oven-safe casserole dish.
2. Add the dry rotini to the casserole dish. Dump in the undrained tuna, condensed soup, milk, and Parmesan cheese.
3. Stir very well, making sure the pasta is evenly coated and the tuna is distributed throughout the dish. Press the pasta down so it is mostly covered by liquid.
4. Cover the dish tightly with foil and bake for 30 minutes.
5. Remove the foil, stir the pasta well, and return the dish to the oven uncovered for 10 to 15 minutes, or until the rotini is tender and the top is lightly golden.
6. Let the casserole stand for 5 to 10 minutes before serving so the sauce can thicken slightly.
Variations & Tips
Add peas: If you do not mind going beyond five ingredients, stir in 1 cup of frozen peas before baking. They fit naturally with tuna casseroles and add color and sweetness.
Choose the right milk: Whole milk will give you the creamiest texture, but 2% works well too. If the casserole seems dry when you stir it halfway through baking, add a small splash of extra milk before returning it to the oven.
Use another condensed soup: Cream of celery or cream of chicken can stand in for cream of mushroom if that is what you have in the pantry. Each brings a slightly different flavor, but the method stays the same.
Watch the pasta shape: Rotini works especially well because the spirals catch the sauce and hold their shape during baking. If you substitute another pasta, choose a similarly sturdy short shape and be prepared to adjust the baking time slightly.
Make it ahead: Assemble the casserole a few hours in advance, cover, and refrigerate. Before baking, let it sit at room temperature for about 20 minutes so the dish does not go straight from cold refrigerator to hot oven.