Preheat oven to 375°F (190°C) and grease a 9x13-inch baking dish.
Heat olive oil in a skillet and sauté onion, bell pepper, zucchini, and garlic 4–5 minutes until tender.
Stir in black beans, corn, salsa, chili powder, cumin, and paprika and simmer 2–3 minutes.
Spread a thin layer of veggie mixture in baking dish.
Layer tortillas, veggie mixture, and shredded cheese.
Repeat layers and finish with cheese on top.
Bake 25–30 minutes until bubbly and golden.
Let rest 5–10 minutes before slicing and garnish with cilantro.