In the saute pan, heat 2 TB olive oil and add the Italian sausage and turkey, sauté until brown over low heat. Drain fat in a colander. Remove to a bowl.
Add 2 more TBs of olive oil to the saute pan , and add sliced onions. Caramelize the onions by cooking over low heat for 20 minutes. Add 1 tsp salt and 1 tsp sugar to aid with the carmelization process.
Add two sliced peppers, and sliced Portabello mushrooms ( wiped dry with a paper towel) Sauté until the veggies are tender, but not mushy. Add the garlic last so that it does not burn.
Add tomato chunks, and let simmer in the sauce until they have broken down. Then add the red wine, tomato paste, dried oregano, red pepper flakes, and salt and pepper. Add the sausage back to the sauce, stir thoroughly, cover the Dutch oven, and let simmer for 20 minutes
While the sauce is simmering, grate the zucchini ( do not need to peel, but wash thoroughly) and add to a separate saute pan with 2 TBs olive oil. Cook the zucchini noodles until tender, but not mushy. Add 1/2 tsp salt and 1/2 tsp oregano.
Put the zucchini noodles on a plate and cover with turkey Bolognese sauce and top with shaved Parmesan cheese. Another gluten free option is chick pea pasta.