In a bowl, combine buffalo sauce, brown sugar, apple cider vinegar, melted butter, soy sauce, garlic powder, chili powder, mustard powder, and salt. Mix until fully dissolved and set aside.
Cut chicken into 2-inch bite-sized pieces and pat dry with paper towels. Season with salt and pepper.
Whisk eggs in a medium bowl until air bubbles form. Add chicken pieces to the eggs and let soak.
Heat vegetable oil in a heavy skillet over medium-high heat until it reaches 365°F.
Coat each chicken piece in cornstarch, then dip back into the egg mixture before frying.
Fry chicken in small batches for 3-4 minutes on each side until golden brown. Drain on a wire rack set over wax paper.
Toss the fried chicken in a large bowl with the prepared sauce, then transfer to a 9x13-inch baking dish.
Bake uncovered for 10 minutes, then toss again in the sauce and bake for another 10 minutes.
Garnish with sliced green onions if desired and serve.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.