Crispy Sheet Pan Gnocchi and Veggies

Name: Crispy Sheet Pan Gnocchi and Veggies
Ingredients: 1 (12-ounce) bag mixed baby bell peppers (or 2 medium bell peppers); 1 small red onion; 4 cloves garlic; 3 sprigs fresh rosemary; 1 pound fresh, shelf-stable, or frozen potato gnocchi; 1 pint grape or cherry tomatoes; 1/4 teaspoon kosher salt; Freshly ground black pepper; 2 tablespoons olive oil, plus more for drizzing; 4 ounces burrata cheese (optional); 2 sprigs fresh basil; Grated Pecorino Romano or Parmesan cheese, for serving; Red pepper flakes (optional)