1. 1. Preheat the oven to 375°F (190°C).

2. 2. In a bowl, mix together crushed cornflake cereal, garlic salt, and onion powder.

3. 3. Dip boneless chicken breast in melted butter, then coat with the cornflake mixture.

4. 4. Heat extra-virgin olive oil in a skillet and brown the coated chicken on both sides.

5. 5. Remove the chicken from the skillet and place it in a baking dish.

6. 6. Top each chicken breast with a slice of American cheese.

7. 7. Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through and the cheese is melted.

8. 8. While the chicken is baking, prepare biscuits according to package instructions.

9. 9. Serve the cheesy chicken breasts on top of warm biscuits with a dollop of sour cream and chunky salsa on the side.