Heat oven to 375°F. Lightly oil a 9x13-inch baking dish.
Boil tortellini in salted water until just shy of tender, 2 minutes less than package. Drain.
Warm olive oil in a large skillet over medium heat. Add onion; cook until softened, 4 minutes.
Stir in garlic; cook 30 seconds. Add ground beef and cook, breaking up, until browned. Drain if needed.
Sprinkle in chili powder, cumin, paprika, salt, and pepper. Toast spices 30 seconds, stirring.
Pour in enchilada sauce and tomatoes. Stir in black beans and corn. Simmer 3 to 4 minutes.
Combine tortellini with the beef sauce in a large bowl; toss gently to coat.
Spread mixture into the baking dish. Sprinkle evenly with shredded cheese.
Bake until bubbling and melted, 15 to 18 minutes. Broil 1 to 2 minutes for extra color, if desired.
Rest 5 minutes. Top with cilantro and green onions, then finish with lime juice. Serve warm.
Notes
Variation: Swap the ground beef for shredded rotisserie chicken, or add sliced jalapeños for heat. Storage: Refrigerate leftovers in an airtight container up to 4 days; reheat covered at 350°F until hot. The baked casserole also freezes well for 2 months—thaw overnight before reheating.This recipe is an original creation inspired by classic Easy Beef Tortellini Enchiladas flavors. All ingredient ratios and instructions are independently developed.