Baked Tortellini (easy and delicious!)

Name: Baked Tortellini with Meat Sauce
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Yield: 6
Ingredients: 1 lb Ground beef, lean; 2 cloves Garlic; 1/2 Yellow onion, medium; 24 oz Marinara sauce; 18 oz Tortellini, refrigerated; 2 tsp Italian seasoning; 1 Kosher salt and fresh-cracked black pepper; 1 1/2 cups Mozzarella cheese; 2 tbsp Parmesan cheese, grated