Preheat the oven to 400°. Heat oil in an 11-inch cast-iron or an ovenproof skillet over medium-high heat. Add onion and peppers. Cook and stir until tender, 2-3 minutes.
Add garlic, and jalapenos and cook for another minute. Stir in corn, beans, enchilada sauce, chili powder, ground cumin. Stir in tortilla strips.
Simmer, uncovered on medium heat until tortilla strips are softened, 3-5 minutes.
Sprinkle cheese on top. Bake, uncovered until sauce is bubbly and cheese is melted 5 to 7 minutes. Garnish with cilantro.
Serve with a dollop of sour cream, sliced avocados, and a squeeze of lime for a tangy touch.
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Notes
To make enchilada casserole vegan, substitute the Mexican cheese blend with dairy-free shredded cheese
This casserole dish is medium spicy, to make it spicier add additional jalapeno or spicy red chili powder
Blacks beans can be substituted with red kidney beans or protein of your choice
Add more enchilada sauce to make the dish saucier or if you add more veggies or protein