Preheat the oven to 400°F (200°C).
Heat a large oven-safe skillet over medium heat. Add the 1 pound ground beef or turkey and break it into small crumbles with a spatula. Cook until browned, about 5–7 minutes.
Season the meat with kosher salt, pepper, ½ teaspoon dried basil, and ½ teaspoon dried oregano while it browns. If using very lean meat, stir frequently to prevent sticking.
Add the 2 minced garlic cloves to the skillet and cook, stirring, until fragrant, about 30–60 seconds.
Stir in the 28 ounces marinara sauce and reduce the heat to low. Let the sauce simmer for 2–3 minutes to heat through and combine with the meat.
Add the 12 ounces cooked cheese tortellini to the skillet and gently fold them into the sauce, taking care not to break the pasta.
Scatter the 8 ounces torn fresh mozzarella evenly over the top of the tortellini and sauce.
Transfer the skillet to the preheated oven and bake 20–25 minutes, until the cheese is melted, bubbly, and beginning to turn golden.
Remove from the oven and sprinkle with parmesan cheese and fresh basil to taste before serving.