Preheat oven to 375 degrees F.
In a large non-stick skillet, brown the ground turkey and onions with salt and pepper over medium heat.
Stir in the marinara sauce, tomato paste, water, oregano, sugar, cinnamon, garlic powder, and crushed red pepper and bring to a boil.
Reduce heat to low and simmer for 10 minutes.
While meat sauce is simmering, cook pasta according to package directions.
When pasta is done, drain and transfer back into the pot, add in spinach and mix until evenly combined.
Once meat sauce is done simmering, add to the pasta and spinach mixture, stirring well.
Spread half of the pasta mix out into an 11 x 7-in casserole dish, then spread the ricotta cheese out evenly across it, then add the remaining pasta over the top of the ricotta.
Sprinkles with mozzarella cheese and bake for 15 minutes.
Let sit for 5 minutes before serving.