Italian Sausage & Spaghetti Squash Casserole - Must Try Recipe!

Ingredients

• 1 medium spaghetti squash, about 3 to 3 1/2 lbs whole (approx 5 cups cooked)
• 1 1/2 pounds ground Italian sausage
• 1/2 cup onion, finely diced
• 1/2 cup orange or red bell pepper, finely diced
• 3 cloves garlic, minced
• 24 oz jar no-sugar-added pasta sauce (or use your favorite homemade sauce)
• 1 egg, beaten
• 1/2 cup grated Parmesan cheese
• 4 cups shredded mozzarella cheese, divided
• 1/2 teaspoon onion powder
• 1/2 teaspoon garlic powder
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• fresh parsley, chopped, as optional topping