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Creamy high-protein tuna casserole with Greek yogurt sauce in a baking dish.

Creamy High-Protein Tuna Casserole

This creamy tuna casserole is a comforting, high-protein dish featuring pasta, tuna, and Greek yogurt, perfect for busy weeknights or family gatherings.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: American
Calories: 350
Ingredients Method Notes

Ingredients
  

Pasta and Base Ingredients
  • 8 oz pasta (any type, cooked to al dente)
  • 1 tbsp olive oil (for sautéing)
  • 1 onion (chopped)
  • 2 cloves garlic (minced)
Sauce Ingredients
  • 1 cup Greek yogurt (plain, for sauce)
  • 1 tbsp mustard (any variety)
Main Ingredients
  • 2 cups shredded cheese (divided) Use any cheese you prefer
  • 1 can tuna (drained)
  • 1 cup frozen peas (for added nutrition)
  • breadcrumbs (optional, tossed with olive oil for topping)

Method
 

Preparation
  1. Bring a large pot of salted water to a rolling boil. Add the pasta and cook until al dente, about 8-10 minutes. Drain and set aside, keeping ½ cup of pasta water for later.
  2. Heat olive oil in a skillet over medium heat. Add chopped onion and cook until translucent and soft, about 4 minutes. Stir in minced garlic and sauté for another minute until fragrant.
  3. In a large bowl, combine the sautéed onion and garlic with Greek yogurt and mustard. Whisk until smooth, adjusting with reserved pasta water if the sauce feels too thick.
Mixing and Baking
  1. Gently mix in the drained tuna, cooked pasta, and frozen peas. Be careful not to break the tuna while combining.
  2. Pour the mixture into a greased baking dish. Top with shredded cheese, and if desired, toss breadcrumbs with olive oil and sprinkle on top for added crunch.
  3. Preheat your oven to 375°F (190°C). Bake the casserole uncovered for 20-25 minutes, until the cheese is melted, bubbly, and delightfully golden brown.
  4. Allow it to rest for 5 minutes before serving.

Notes

This casserole is best served warm right out of the oven. Leftovers are just as delicious, making it a fantastic option for lunch the next day. For extra flavor, consider adding herbs like dill or parsley. You can also substitute the tuna with cooked chicken or chickpeas for a vegetarian option.