Go Back
crockpot tuna casserole

One-Pot Crockpot Tuna Casserole

Delicious One-Pot Crockpot Tuna Casserole recipe with step-by-step instructions.
Print Recipe Pin Recipe
Prep Time 1 hour
Cook Time 2 hours 2 minutes
Total Time 3 hours 2 minutes
Servings: 4
Calories: 2100
Ingredients Method

Ingredients
  

For the casserole:
  • 12 oz uncooked egg noodles
  • 1 can (10.5 oz) condensed cream of mushroom soup
  • 2 cups chicken broth for slow cooker or 3.5 cups for pressure cooker
  • 1 cup diced onion
  • 3 cans (5 oz each) tuna, drained
  • 2 tbsp Italian blend seasoning
  • 1/2 tsp salt
  • 1/2 tsp ground black pepper
  • 8 oz canned mushrooms, sliced and drained
  • 1 1/2 cups frozen peas
For the topping:
  • 1 cup shredded cheddar cheese
  • optional: 1/4 cup dry breadcrumbs

Method
 

  1. Bring a large pot of salted water to a boil. Add the egg noodles and cook according to package instructions until just a little underdone (al dente). Drain well and set aside for later use. I always make sure not to overcook the noodles, as they'll finish cooking in the casserole.
  2. In a large bowl, whisk together the cream of mushroom soup and 2 cups of chicken broth until smooth and creamy. Add in the drained tuna, diced onion, Italian seasoning, salt, and black pepper. Stir until everything is well combined. Then gently fold in the undercooked noodles (from Step 1) until evenly coated with the sauce.
  3. Transfer the noodle mixture into your slow cooker. Cover and cook on LOW for 3 to 4 hours or on HIGH for 1½ to 2 hours, stirring occasionally if possible, until everything is heated through. This gentle cooking blends the flavors beautifully.
  4. 15 minutes before the cook time ends, lift the slow cooker lid. Gently fold in the sliced mushrooms (drained) and frozen peas. Stir in ½ cup of the shredded cheddar cheese until mixed throughout the casserole. Top the casserole with the remaining ½ cup of cheese and replace the lid, allowing the cheese to melt into the casserole for the final 15 minutes. I like to let the cheese bubble just a bit for extra flavor.
  5. Once the cheese is melted and the casserole is hot, sprinkle the top with dry breadcrumbs just before serving, if desired. Serve hot and enjoy!