Tuck into this easy and comforting classic- Tuna Noodle Casserole. With a homemade mushroom gravy, hearty tuna, and a crispy chip top, this will quickly become a family favorite.
Add oil to a large saucepan over medium heat. Add in the onion and mushrooms, stirring occasionally, until softened, about 5 minutes. Next, add in garlic and saute until fragrant, about 1 minute.
Next, add in the butter. Once melted and incorporated, add in the flour and stir to combine. After about a minute, pour a little of the broth in, stirring quickly to thicken. Slowly add the rest of the broth in, stirring frequently. Then add milk in.
Add in the black pepper, chicken bouillon, and salt. Bring to a gently boil, and reduce heat to low, stirring occasionally. It should thicken after several minutes. Taste and add more salt if needed.
Add the frozen peas and tuna to the pot, stirring into the mushroom soup. Then, stir in the cooked pasta.
Transfer to a 13 x 9 glass baking dish and spread evenly. Add as much crushed chips to the top as your heart desires. Bake, uncovered, for 20 minutes.