01 - Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray or a small amount of oil.
02 - In a large skillet, heat olive oil over medium heat. Add chopped onion and cook until softened and translucent, about 3 minutes. Add minced garlic and cook for 1 minute until fragrant.
03 - Stir in cumin, chili powder, smoked paprika, salt, and black pepper. Add diced tomatoes, black beans, and corn. Cook for 2 minutes, then add shredded chicken. Mix well to combine all ingredients and heat through completely. Remove from heat.
04 - Spread 1/2 cup of enchilada sauce evenly across the bottom of the prepared baking dish to create a base layer.
05 - Warm tortillas briefly to increase pliability. Microwave for 20 seconds covered with a damp paper towel, or heat individually in a dry skillet for 15-20 seconds per side.
06 - Place approximately 1/3 cup of chicken filling in the center of each warmed tortilla. Fold in the sides and roll up tightly. Place each rolled enchilada seam-side down in the baking dish, arranging them closely together.
07 - Pour the remaining enchilada sauce evenly over all the rolled tortillas, ensuring complete coverage. Sprinkle the shredded Mexican cheese blend generously over the top.
08 - Bake uncovered for 20 to 25 minutes, or until the cheese is fully melted, bubbly, and beginning to turn golden brown around the edges.
09 - Let the enchiladas cool for 5 minutes to set. Garnish with fresh chopped cilantro and thinly sliced jalapeño. Serve warm with sour cream on the side.