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Tuna Noodle Casserole (From Scratch!)

A cozy bowl of homemade, creamy, and crispy-topped Tuna Noodle Casserole being served for a family dinner.

A healthy, from-scratch recipe for a classic Tuna Noodle Casserole. This comforting one-pot (mostly) meal features a creamy sauce made with a simple roux, milk, and broth, avoiding canned soups. The sauce is packed with sautéed vegetables like onions, carrots, and mushrooms. Cooked egg noodles, flaked tuna, and peas are then folded into the creamy sauce along with cheddar cheese. The casserole is transferred to a baking dish, topped with a crunchy mixture of Parmesan cheese and whole wheat breadcrumbs, and baked until hot and bubbly.

Ingredients

  • 2 Tablespoons olive oil
  • 1 medium onion, diced
  • 1 Tablespoon minced garlic
  • 2 medium carrots, diced
  • 8 ounces sliced mushrooms
  • 3 Tablespoons all-purpose flour
  • 2 cups chicken or vegetable broth
  • 1 cup milk of choice
  • 1 teaspoon salt
  • 1/2 teaspoon pepper
  • 1 teaspoon dried thyme
  • 1 1/2 cups peas (frozen or canned)
  • 2 teaspoons Dijon mustard
  • 1 cup shredded cheddar cheese
  • 12 ounces egg noodles, cooked
  • 2 (5-ounce) cans tuna, drained
  • 1/4 cup grated Parmesan cheese
  • 1/4 cup whole wheat breadcrumbs
  • Optional additions: 1 cup steamed broccoli, 2 cups chopped kale

Instructions

  1. Preheat the oven to 375°F. Cook the egg noodles according to package directions until al dente.
  2. While the noodles cook, heat the olive oil in a large pot or Dutch oven. Add the diced onion and sauté for 5-7 minutes.
  3. Add the diced carrots, minced garlic, and sliced mushrooms. Sauté for an additional 5-7 minutes until tender.
  4. Whisk in the flour until blended, then gradually whisk in the broth and milk until smooth.
  5. Bring the sauce to a boil, stirring constantly. Cook and stir for 2-3 minutes until it has thickened.
  6. Remove the pot from the heat. Stir in the salt, pepper, thyme, peas, Dijon mustard, and the shredded cheddar cheese until the cheese is melted.
  7. Gently fold in the cooked and drained noodles and the drained tuna.
  8. Transfer the mixture to a greased 9×13-inch baking dish.
  9. In a small bowl, mix together the Parmesan cheese and the breadcrumbs. Sprinkle this mixture over the top of the casserole.
  10. Cover with foil and bake for 25 minutes. Uncover and bake for an additional 5-10 minutes, until the topping is golden brown and the casserole is bubbly.
  11. Let it rest for a few minutes before serving.

Notes

  • This ‘healthy’ version of the classic casserole is made completely from scratch, avoiding canned condensed soups.
  • The two-stage baking process—covered first, then uncovered—ensures the casserole heats through evenly while allowing the breadcrumb topping to get nicely browned and crispy.
  • You can easily add more vegetables like steamed broccoli or chopped kale to the filling for extra nutrients.