Bring a large pot of salted water to a boil, add tortellini, and cook according to package instructions for 3-5 minutes. Drain and rinse under cold water.

In a large skillet, heat olive oil over medium-high heat, add chopped onion and sauté until translucent, about 3 minutes. Add ground beef and cook until browned, about 5-7 minutes.

Drain excess grease from skillet, return to heat, and season with Italian seasoning, onion powder, garlic powder, salt, and black pepper. Stir to combine.

Pour in the marinara sauce and stir to combine with the beef mixture. Gently fold in the cooked tortellini and cook for an additional 2-3 minutes.

Dollop ricotta cheese evenly over the tortellini mixture, followed by shredded mozzarella cheese.

Preheat oven to 350°F (175°C). Transfer to a greased baking dish and bake for 10-15 minutes until cheese is melted and bubbly.

Remove from oven and let cool for a few minutes before serving. Pairs perfectly with garlic bread or Caesar salad.