Add to stainless steel pot 1 can tomato purée, 1 can tomato sauce. Add garlic and seasonings. Simmer on low heat on stovetop with seasonings.
wash vegetables. slice mushrooms, dice red bell pepper, and red onions. Add into sauce to Cook on low heat, stirring occasionally for 1 1/2 hrs.
Now split Spaghetti Squash for baking. Set oven at 300 degrees for a slow bake, split Squash lengthwise placing into large rectangular baking pan, upside down with Olive oil drizzle on outer skin. Fill pan to half way of Squash. bake at 300 for 2 1/2 -3 hrs.
Bake at 300 degrees for 2 1/2-3 hrs until skin is golden brown and inside is softened. remove from oven then flip with spatula.
Spoon up Tomato sauce into Spaghetti Squash. Best served with garlic bread made of a French loaf split buttered w/ garlic spread wrapped in foil and Heated during final 25 minutes of baking. Serve with a side of fresh spinach salad.