Start by preheating your oven to 375°F (190°C). This will ensure your pasta bake is hot and bubbly when it comes out of the oven.

Dice the onion and basil and measure out your remaining ingredients.

Next cook your Italian Sausage and slide to the side of your skillet, then add in the ground beef.

While the meat is cooking, cook the 3 cheese Tortellini per package instructions in salted water.

In a large skillet or sauté pan, cook the chicken Italian sausage over medium heat until browned and cooked through. Use a wooden spoon to break it up into small pieces as it cooks.

Remove the sausage from the pan and set aside.

In the same pan, add the ground beef and cook until browned. Drain any excess fat.

Add the diced onion and cook until soft and translucent, about 5 minutes.

Stir in the tomato paste and cook for another 2 minutes.

Add the tomato sauce, heavy cream, oregano, red pepper flakes, and all-purpose seasoning.

Mix well and let the sauce simmer for about 10 minutes, allowing the flavors to meld together.

Return the cooked sausage to the pan and stir to combine.

In a large baking dish (about 9x13 inches), spread a thin layer of the meat sauce mixture on the bottom.

Add a layer of tortellini on top of the sauce, then pour over more of the meat sauce mixture.

Repeat the layers until all the tortellini and sauce are used, ending with a layer of sauce on top.

Sprinkle the shredded mozzarella cheese and grated Parmesan cheese evenly over the top.

Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes.

Then, remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly and the top is golden brown.

Once out of the oven, let the Tortellini Pasta Bake cool for a few minutes. Garnish with fresh basil leaves before serving.