Bang bang chicken

Ingredients 1, 2 cup vegetable oil, or more, as needed 1 cup buttermilk 3, 4 cup allpurpose flour 1, 2 cup cornstarch 1 large egg 1 tablespoon hot sauce Kosher salt and freshly ground black pepper, to taste 1 pound boneless, skinless chicken breasts, cut into 1inch chunks 1 cup Panko For the sauce