Preheat your oven to 375°F (190°C). Lightly grease your 9x13 inch baking dish with olive oil or non-stick spray to prevent sticking.
In a medium bowl, combine the ricotta cheese, half of the shredded mozzarella, and half of the Parmesan cheese. Stir in the Italian seasoning, garlic powder, salt, and pepper to create the creamy cheese base.
In a large bowl, toss the uncooked cheese tortellini with the marinara sauce and the crumbled cooked turkey bacon. Ensure every piece is coated evenly.
Spread half of the saucy tortellini mixture in the bottom of the prepared baking dish. Dollop and gently spread half of the cheese mixture over the tortellini layer. Add the remaining tortellini mixture on top, then finish with the remaining cheese mixture.
Sprinkle the remaining mozzarella and Parmesan cheese evenly over the top to create a golden, bubbly crust once baked.
Cover the baking dish with foil and bake for 25 minutes. Remove the foil and bake uncovered for another 10-15 minutes, or until the cheese is melted, bubbly, and edges are slightly crisp.
Allow the casserole to cool for about 5 minutes before serving. Garnish with fresh basil leaves for a pop of color and fresh flavor. Serve warm.