Turkey Spaghetti With Sausage and Peppers

INGREDIENTS

• 8 ounces uncooked spaghetti
• 1 (1-lb.) package Italian turkey sausage
• 2 tablespoons olive oil, divided
• 1 medium onion, cut into eighths
• 1 medium-size green bell pepper, cut into strips
• 1 medium-size red or yellow bell pepper, cut into strips
• 2 to 3 garlic cloves, minced
• 1 (28-oz.) can diced tomatoes with basil, garlic, and oregano
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 1/2 cup grated Parmesan cheese