Place the squash halves on a baking sheet. Drizzle with olive oil and season with salt and pepper.
Bake for 30 minutes, or until the squash is tender.
Meanwhile, heat olive oil in a large skillet over medium heat. Add the onion, bell pepper, mushrooms, and garlic. Cook, stirring occasionally, for 5 minutes.
Add the oregano, red pepper flakes, salt and black pepper. Cook for an additional 5 minutes.
Stir in the quinoa, black beans, and cheese. Cook for an additional 5 minutes.
Stir in the parsley. Remove from heat.
Stuff the squash halves with the quinoa mixture.
Bake for an additional 10 minutes, or until the cheese is melted and the squash is heated through.
Serve warm.
Interesting Facts
Spaghetti squash is a low calorie, low carb alternative to pasta.
Spaghetti squash is an excellent source of Vitamin C and dietary fiber.