- Preheat the oven to 350°F (175°C).
- Cook the gluten-free pasta according to package instructions; drain and set aside.
- In a large bowl, combine the drained tuna, frozen peas, cream of mushroom soup, milk, garlic powder, onion powder, salt, and pepper.
- Add the cooked pasta to the mixture and stir until well combined.
- Transfer the mixture to a greased baking dish and top with shredded cheddar cheese and breadcrumbs.
- Bake for 25-30 minutes or until the casserole is bubbly and the top is golden brown.
- Let it cool for a few minutes before serving.
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