Preheat the oven to 400°F (200°C).
Heat 1 tablespoon avocado oil in a large oven-safe skillet over medium-high heat.
Add the diced onion, minced garlic, diced red bell pepper, and chopped zucchini; cook 2–3 minutes, stirring frequently, until softened.
Stir in the corn and drained black beans until combined.
Add the chili powder, smoked paprika, kosher salt, cumin, and ground black pepper and mix thoroughly.
Pour the 20 ounces of enchilada sauce into the skillet and stir to coat the vegetable and bean mixture.
Add the tortilla strips to the skillet and gently fold them into the sauce and vegetables; cook 2 more minutes to warm the tortillas.
Sprinkle the shredded Mexican cheese evenly over the top.
Transfer the skillet to the preheated oven and bake 6–7 minutes, until the cheese is melted and bubbly.
Remove from oven and top with sliced green onion, chopped cilantro, and a squeeze of fresh lime juice before serving.