In a skillet, heat olive oil over medium heat. Add diced onions and cook until translucent.
Add chorizo sausage to the skillet and cook until browned. Drain excess fat.
Stir in diced tomatoes, ground cumin, and chili powder. Cook for another 5 minutes.
In a baking dish, layer half of the tortilla strips, half of the chorizo mixture, half of the enchilada sauce, and half of the shredded cheese. Repeat layers.
Cover with aluminum foil and bake for 30 minutes. Remove foil and bake for an additional 10 minutes or until cheese is bubbly and golden.
Let cool for 10 minutes before serving. Top with sour cream if desired.
Notes:
Feel free to add more veggies like bell peppers or corn for extra flavor.