Best Southern Fried Chicken Batter

Ingredients

• 3 spray(s) cooking spray
• 1 pound(s) uncooked boneless skinless chicken breast(s), four 4-oz pieces
• ¹/₂ tsp table salt, divided, or to taste
• ¹/₄ tsp cayenne pepper, divided, or to taste
• ¹/₃ cup(s) all-purpose flour
• 3 oz low-fat buttermilk
• ¹/₂ cup(s) cornflake crumbs