In a large skillet over medium heat, brown ground beef with diced onion until cooked. Drain the excess grease.
Stir in tomato paste; cook for 2-3 minutes.
Add taco seasoning, enchilada sauce, and drained Rotel; stir to combine.
Stir in frozen cheese tortellini. Cover and simmer on low-medium heat for about 5-7 minutes, stirring occasionally, until tortellini is heated through.
Top with shredded Colby Jack cheese. Cover until melted.Garnish with green onions if desired.
Notes
Storage and Reheating
Storage: Store leftovers in an airtight container in the fridge for up to 3 days.
Reheating: Microwave individual portions until hot, or reheat on the stovetop with a splash of water to loosen it back up.