Sauté: First, heat the olive oil in the skillet over medium heat. Add onion, pepper, and sweet potato. Cook for 8-10 minutes, stirring occasionally, until potatoes are tender.
Season: Next, add garlic, cumin, and chili powder. Cook for 1 minute until fragrant.
Simmer: Pour in the enchilada sauce and add the black beans. Stir to combine and let it bubble for 2 minutes.
Add Strips: Then, gently fold in the corn tortilla strips. Ensure they are coated in sauce.
Melt Cheese: Sprinkle the cheese evenly over the top. Place the skillet under the broiler for 3-4 minutes (or cover with a lid on the stove) until the cheese is melted and bubbly.
Serve: Finally, remove from heat, top with cilantro and avocado, and serve hot.