Remove casings from sausage. Cook sausage in a large nonstick skillet coated with cooking spray over medium-high heat until browned, stirring to crumble. Add onion and garlic; sauté 2 minutes. Add mushrooms, bell peppers, and zucchini; sauté 5 minutes or until vegetables are tender and sausage is done. Stir in tomatoes; cover and cook over medium-low heat 10 minutes. Remove from heat; stir in sour cream. Add pasta and black pepper; stir well. Cook over medium-low heat 3 minutes or until thoroughly heated.