Step 1

Preheat oven to 375 F (190 C) and grease the bottom of a 9x13-inch baking dish.

Step 2

In a large skillet over medium-high heat, cook ground beef until browned and completely cooked through, breaking it into small pieces as it cooks. Transfer beef to a bowl and set aside. Discard the remaining grease.

Step 3

In the same skillet, heat olive oil over medium heat, add onion and cook until soft, about 4 minutes. Add garlic and cook for 1 more minute.

Step 4

Add cooked ground beef, taco seasoning, green chiles, and beans. Pour in 1/2 cup of water and bring to a simmer, stirring occasionally. Add 1-2 Tbsp more water if needed. Remove pan from heat.

Step 5

Use 3 tacos cut in half and 1 whole taco to line the baking dish (see picture above). Spread 1/3 of the salsa on top and then 1/2 of the meat mixture. Drop 1/2 of the sour cream over the meat and spread out with a spatula. Top with 1 cup of cheese. Repeat layers. Top with 4 tortillas, remaining salsa, and cheese.

Step 6

Bake for 30-40 minutes, or until the cheese is melted and lightly browned.