Heat 2 tablespoons olive oil in a Dutch Oven (or very large pot) over medium high heat. Add meat and season with 1/2 teaspoon salt, 1/2 teaspoon pepper and 1/4 teaspoon red pepper flakes. Add onions and carrots and cook until meat is browned.
Add mushrooms and continue to cook for 5 minutes, stirring occasionally. Add squash, bell peppers and garlic and cook for 1 minute.
Stir in all of the remaining “Bolognese Sauce ingredients” and bring to a simmer. Simmer gently uncovered for 15 minutes, stirring occasionally.
Meanwhile, preheat oven to 350 degrees F.
After 15 minutes, discard bay leaf and stir in 1/4 cup milk, 1/2 cup Parmesan and the uncooked tortellini. Stir until well combined then pour 1/2 of this Bolognese tortellini into a 9x13 casserole dish. Top with 1 cup mozzarella then top with remaining Bolognese tortellni followed by remaining cheeses.
Cover tightly with foil and bake at 350 degrees for 30 minutes then remove foil and broil cheese until golden brown.
Notes
***Use your favorite quality tortellini because that's what makes this dish! I love the Seven Cheese Olivieri Tortellini from the refrigerated section at Costco as well as
3 Cheese Buitoni Tortellini.