Heat large skillet over medium-high heat. Once hot, crumble in meat and cook until browned, stirring occasionally. Drain fat, set cooked meat aside.
Heat olive oil in skillet, once hot and add onion and green peppers and sauté until tender, about 3 minutes, adding in garlic & mushrooms during last 30 seconds of sautéing.
Pour in diced tomatoes, and sauce. Stir in fresh parsley, the basil, oregano, and season with salt and pepper to taste.
Bring just to a gentle boil then add cooked spaghetti squash noodles and cooked meat, stir and submerge noodles in liquid, then reduce heat to a simmer for 2 minutes until heated through.
Garnish with fresh chopped basil and a touch of parmesan, serve warm.