out onto the baking sheet, add the oil, and toss to coat. toast, stirring halfway through, three to four minutes; set aside to cool.
place the egg, mayonnaise, salt, garlic powder, and pepper in a large bowl and whisk until smooth; set aside.
working with one chicken breast at a time, place inside a large zip-top bag and pound with the flat side of a meat mallet or rolling pin to an even 1/4-inch thickness. set the flattened chicken breast aside and repeat with remaining breasts.
pat the chicken dry on both sides with paper towels. this is just a little extra insurance that the coating will stick well.
transfer the chicken to the 