Boil water for pasta and follow directions on the shell pasta box. Typically 8-10 minutes to cook medium shells.
In a dutch oven or wide stock pot, heat 2 Tbsp. of the olive oil over medium heat and cook the ground turkey. Season the ground turkey with salt and pepper. Once cooked, place ground turkey in a bowl and set aside.
Then place remaining tablespoon olive oil in the same pan. Sauté the garlic, bell peppers, mushrooms and onions with salt, pepper and Italian seasoning until fragrant (about 5 minutes, stirring occasionally). Then whisk in the flour until combined. Pour in the beef broth and tomato sauce and let it come to a simmer. Then add in the cooked ground turkey.
Pour in the cooked shells or pasta of choice, heavy cream and Parmesan. Stir to combine. Taste and adjust salt and pepper, as desired. If you would like it creamier, add more heavy cream.
*Optional to make a pasta bake: place pasta in an oven safe dish (or leave in dutch oven) and bake at 350° F. for and additional 20 minutes. You can top with more Parmesan if desired. Enjoy.
Other seasonings that make a great addition, but not necessary include garlic power, onion powder, red pepper chili flakes, dried oregano and cayenne.