Preheat the oven to 425F. Place a large oven-safe skillet over medium-high heat. Add in the olive oil and let it heat up.
Add in ground beef, red bell pepper, and zucchini. Break the meat apart using a spatula and cook for 7-9 minutes until the beef browns up and zucchini softens up.
Add in garlic powder, ground cumin, dried oregano, and chili powder. Then, pour in red enchilada sauce, add in the black beans, corn, and Monterey Jack cheese. Stir to combine well.
Now, gently fold in the corn tortilla wedges to coat them with sauce and spread them around.
Sprinkle with cheddar cheese and bake in the oven for 10-15 minutes. Once baked through, remove the skillet from the oven.
Garnish with avocado, tomatoes, green onion, cilantro, and sour cream.