Sheet-Pan Italian Sausage with Peppers, Onions, Tomatoes, and Polenta | America's Test Kitchen

Ingredients

• ¼ cup extra-virgin olive oil
• 12 ounces grape tomatoes
• 1 onion , halved and sliced thin
• 1 red bell pepper , stemmed, seeded, and cut into ¼-inch-wide strips
• 1 garlic clove , minced
• 1 teaspoon minced fresh rosemary
• Salt and pepper
• 1 pound sweet or hot Italian sausage
• 1 (18-ounce) tube cooked polenta , sliced in half lengthwise
• 1 ounce Parmesan cheese , grated (½ cup)
• 2 tablespoons chopped fresh basil