Sheet-Pan Sausage & Peppers

Name: Sheet-Pan Sausage & Peppers
Cook time: 30 min
Total time: 30 min
Cuisine: European, American, Mediterranean
Ingredients: 1 small (5 1/2 ounce) red onion, sliced (1 1/4 cups); 1 medium red bell pepper, sliced (1 cup); 1 medium orange bell pepper, sliced (1 cup); 1 medium yellow bell pepper, sliced (1 cup); 1 cup thinly sliced fennel (from 1 small fennel bulb); 1 tablespoon olive oil; ¼ teaspoon black pepper; ⅛ teaspoon kosher salt; 1 (12 ounce) package Italian-style smoked chicken sausage (such as Aidells); 4 medium garlic cloves, crushed; ¼ ounce Parmesan cheese, shaved (about 2 tablespoons); 2 tablespoons torn fresh basil; ½ teaspoon crushed red pepper