Copycat Fried Chicken Sandwich
1 cup buttermilk 1 dash hot sauce, or to taste 1 large egg, beaten 1 tablespoon dry ranch dressing mix (such as … 1 ½ teaspoons cayenne pepper 1 ⅓ cups all-purpose flour 12 dill pickle slices, or to taste 2 tablespoons cornstarch 2 teaspoons kosher salt 4 (5 ounce) skinless, boneless chicken breast… 4 soft hamburger buns, toasted and buttered 6 tablespoons mayonnaise, or to taste canola oil for frying ¼ cup milk ½ cup buttermilk ½ teaspoon freshly ground black pepper