Unstuffed Zucchini Casserole

Name: Unstuffed Zucchini Casserole
Ingredients: 2 medium zucchini , sliced into ½-inch rounds (about 4 cups ); ½ teaspoon crushed red pepper; ¼ teaspoon salt; 1 tablespoon extra-virgin olive oil; 1 pound lean ground beef; 1 small yellow onion , finely chopped ( 1 cup ); 1 small red bell pepper , chopped ( 1 cup ); 3 medium cloves garlic , thinly sliced (about 1 tablespoon ); 2 teaspoons Italian seasoning , divided; 1½ cups lower-sodium marinara sauce; 1 tablespoon red-wine vinegar; ½ cup shredded sharp Cheddar cheese; ¼ cup shredded Italian 4-cheese blend; 1 tablespoon small fresh basil leaves