In a medium saucepan, crumble and cook turkey sausage over medium-heat until just cooked.

Add onion, garlic, Italian seasoning and salt and cook, stirring often, until onion has softened - about 5 minutes.

Stir in marinara sauce and turn off the heat.

Meanwhile, cook pasta according to package directions, removing from the heat 1-2 minutes before the cook time is up so pasta still has a slight bite to it. Drain and toss with oil to prevent from sticking.

Spread a thin layer of sauce in the bottom of the dish.

Top with half of the pasta, half of the sauce, half of the ricotta (dollop it and swirl into the sauce if you desire), half of the mozzarella and half of the Parmesan. Repeat layers one more time to use remaining ingredients.

Cover and bake for 20-30 minutes until bubbly. Remove lid and broil for 1-2 minutes if desired.