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Close-up of a fork holding a bite of creamy pasta with spinach, next to a plate of casserole topped with a crispy, crumbly layer, enriched by the savory blend of sour cream and onion tuna.
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Sour Cream and Onion Tuna Bake

This Easy Sour Cream and Onion Tuna Bake is the perfect solution for busy weeknights or when you need a warm, comforting meal on the table fast. Its creamy texture, savory onion flavor, and crispy topping make it irresistible for both kids and adults.
Course Main Course
Cuisine American
Keyword canned tuna, sour cream and onion tuna bake, tuna bake, tuna casserole
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 8
Calories 573kcal
Author Christina

Ingredients

  • 1 package uncooked pasta elbow or shell works best
  • 1 onion chopped
  • 2 tbsp butter
  • 2 cloves garlic crushed
  • 2 tbsp flour
  • 2 cups whole milk
  • 2 5 oz cans of tuna, drained
  • 3 cups fresh spinach chopped, optional
  • 1 cup mushrooms chopped, optional
  • 1 cup sour cream
  • 1 tsp dried mustard
  • Salt and pepper to taste
  • 2 cups shredded cheddar cheese divided
  • ½ cup breadcrumbs

Instructions

  • Preheat your oven to 350°F (175°C).
  • Cook the pasta according to the package instructions, but reduce the cooking time by 1-2 minutes to keep it slightly firm.
  • Drain and set aside.
  • Cook onions and butter until onions are just transluscent.
  • Sprinkle flour over the top of the onion and butter mixture.
  • Cook and stir until flour just starts to brown.
  • Add milk and whisk until thick and bubbly.
  • Remove from heat.
  • Add the sour cream, garlic, mushrooms, spinach, mustard, salt, pepper, and one cup of cheese. Stir until well blended.
  • Add the drained tuna and cooked pasta. Mix until all the ingredients are evenly coated.
  • Transfer the mixture into a greased 9×13-inch baking dish. Spread it out evenly.
  • Sprinkle the remaining shredded cheddar cheese over the top.
  • Sprinkle the breadcrumb mixture over the cheese layer.
  • Place the casserole in the preheated oven and bake for 25-30 minutes, or until the topping is golden brown and the casserole is bubbling around the edges.
  • Let the casserole cool for 5 minutes before serving.

Nutrition

Calories: 573kcal | Carbohydrates: 53g | Protein: 31g | Fat: 26g | Saturated Fat: 14g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 6g | Trans Fat: 0.1g | Cholesterol: 90mg | Sodium: 549mg | Potassium: 415mg | Fiber: 3g | Sugar: 4g | Vitamin A: 1818IU | Vitamin C: 5mg | Calcium: 422mg | Iron: 3mg