Creamy Basil Chicken Skillet with Corn and Tomato

Name: Creamy Basil Chicken Skillet with Corn and Tomato
Ingredients: 4 boneless, skinless chicken breasts (about 1 3/4 lb. total); Kosher salt; Freshly ground black pepper; 1/4 c. extra-virgin olive oil, divided; 1 sweet onion, halved and thinly sliced lengthwise; 2 c. cherry tomatoes, halved; 4 cloves garlic, minced; 1/2 tsp. crushed red pepper flakes; 3 c. fresh or frozen corn kernels (from about 4 ears); 1/2 c. heavy cream; 1/2 c. fresh basil leaves, chopped; 1/4 c. finely grated Parmesan