Dorito casserole layers crunchy Dorito chips with seasoned ground beef, cheese, and sour cream for a fun family Tex-Mex bake. This protein-packed crowd-pleaser is a guilty pleasure that kids and adults alike devour.
Preheat oven to 350°F and lightly grease a 9x13-inch baking dish.
In a skillet over medium-high heat, sauté chopped onion until translucent, about 4 minutes. Add ground beef and cook, stirring frequently, until browned and no pink remains.
Stir in taco seasoning, salt, pepper, and diced tomatoes. Simmer on low for 5 minutes to develop flavors and thicken mixture.
Spread half the Dorito chips on the bottom of the baking dish. Layer with half the beef mixture, half the sour cream, and half the cheddar cheese. Repeat layering with remaining Doritos, beef, sour cream, and cheese.
Cover loosely with foil and bake for 20 minutes. Remove foil and bake another 10 minutes, until cheese is bubbling and lightly golden. Let rest for 10 minutes before serving to set layers.