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Cut each chicken breast horizontally to create a "book" shape. Flatten slightly and season with salt, black pepper, and white pepper.
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Combine softened butter, minced garlic, and chopped parsley. Divide into two equal portions and shape into small logs. Chill in the refrigerator or freezer for 10-15 minutes.
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In one bowl, whisk together flour, cornflour (if using), egg, black pepper, white pepper, and salt. Place breadcrumbs in another shallow dish.
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Place a chilled butter log in the center of each chicken breast. Fold the chicken around the butter, sealing the edges.
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Dredge each stuffed chicken breast in the flour mixture, then dip in the egg mixture, and finally coat thoroughly with breadcrumbs.
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Heat oil in a skillet over medium heat. Shallow fry the chicken for 8-10 minutes per side, until golden brown and cooked through.
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Remove from skillet and let rest on a wire rack or paper towel-lined plate for a few minutes before serving.