Heat oven to 375°F. Lightly grease a 9x13-inch baking dish.
Warm olive oil in a large skillet over medium-high heat. Brown the beef with onion and bell pepper, 6–8 minutes. Drain excess fat.
Stir in garlic, chili powder, cumin, smoked paprika, salt, and pepper. Cook until fragrant, about 1 minute.
Fold in black beans and corn. Remove from heat and set aside.
Whisk enchilada sauce with sour cream in a bowl until smooth.
Spread 1/2 cup sauce mixture in the baking dish. Crinkle torn tortilla strips slightly and arrange half over the sauce.
Spoon half of the beef mixture over tortillas. Drizzle about 1 cup sauce and sprinkle 1 cup cheese.
Repeat layers with remaining tortillas and beef. Top with most of the remaining sauce and the rest of the cheese.
Bake until bubbly and the cheese is melted, 20–25 minutes. Broil 1–2 minutes for extra browning if desired.
Let rest 10 minutes. Finish with cilantro and a squeeze of lime. Slice and serve.
Notes
Variation: Swap the beef for shredded rotisserie chicken or sautéed mushrooms. For a spicier kick, layer in sliced jalapeños. Storage: Cover and refrigerate up to 3 days; reheat covered at 350°F until hot or microwave individual portions.This recipe is an original creation inspired by classic Easy Crinkle Tortilla Casserole flavors. All ingredient ratios and instructions are independently developed.