Preheat oven to 350°F.

In a skillet, brown ground beef with chopped onion until fully cooked. Drain excess fat.

Stir in green chilies, enchilada sauce, and cream cheese. Cook until cream cheese is melted and mixture is well combined.

In a 9x13-inch baking dish, layer Fritos, meat mixture, and shredded cheese. Repeat layers if desired.

Bake for 15–20 minutes, until cheese is melted and bubbly.

Serve topped with shredded lettuce, diced tomatoes, salsa, and sour cream as desired.