Sheet-Pan Gnocchi with Sausage, Peppers and Onions

Ingredients

• 12 ounces baby bell peppers (or regular bell peppers), halved
• 1 small red onion, sliced
• 4 garlic cloves, peeled and smashed
• One 16-ounce package store-bought gnocchi (fresh or shelf-stable)
• Extra-virgin olive oil, as needed
• Kosher salt and freshly ground black pepper
• 1 pound hot Italian sausage, casings removed
• Fresh basil, Parmesan cheese and flaky salt, to garnish