Begin by gathering all the necessary ingredients.
Preheat your oven to 400°F (200°C).
Place the crushed French-fried onions in a shallow bowl. In a separate shallow bowl, pour the beaten egg.
Dip each chicken breast into the beaten egg, ensuring it is fully coated. Then, press the chicken into the crushed onions, gently tapping to remove any excess pieces. Arrange the breaded chicken on a baking sheet.
Bake the chicken for approximately 20 minutes or until the internal temperature reaches 165°F (74°C) and the juices run clear. An instant-read thermometer inserted into the thickest part of the chicken should confirm the proper temperature.