Begin by preheating your oven to 375°F (190°C). Lightly grease a standard 9×13-inch baking dish.

Using a spacious skillet, brown the ground beef over medium-high heat. Once done, drain and set aside.

In the same skillet, sauté onions in olive oil until translucent. Introduce minced garlic, cooking for another minute.

Return the browned beef to the skillet, blending in taco seasoning, green chiles, and beans. Add water and let the mixture simmer. If it appears thick, sprinkle an additional 1-2 Tbsp of water.

Assemble the lasagna by starting with a layer of tortillas. Over this, spread a portion of salsa, followed by half of the beef mixture. Evenly dollop half of the sour cream, spreading it gently. Sprinkle with cheese. Repeat the layering process. Finish with a final layer of tortillas, the remaining salsa, and a generous amount of cheese.

Bake until the cheese bubbles and turns a golden hue, typically between 30-40 minutes.