Heat a large skillet over medium heat. Add diced onion and chopped bell peppers; cook until softened.
Add ground beef to the skillet, breaking it apart as it cooks until browned. Drain excess fat.
Stir in minced garlic, chili powder, cumin, oregano, salt, and pepper; cook for one minute until fragrant.
Add tortellini and enchilada sauce to the skillet; mix gently to coat all pasta.
Reduce heat to low, sprinkle shredded cheese on top, cover with a lid until melted.
Give it a stir before serving and garnish with cilantro if desired.