Sheet Pan Sausage Peppers and Onions

Name: Sheet Pan Sausage, Peppers, and Onions
Ingredients: 3 large bell peppers in assorted colors, cut into 1-inch chunks; 1 large red onion , cut into 1-inch chunks; 1 tablespoon olive oil; 1/2 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 1 pound uncooked sweet or hot Italian sausage; Fresh parsley or basil leaves for garnish, chopped (optional)