Fried Chicken Sandwiches - Once Upon a Chef

Ingredients

• 3 boneless, (skinless chicken breasts (about 1⅓ lbs))
• 2 cups cold water
• 2 tablespoons + ¾ teaspoon salt
• 2 teaspoons sugar
• 4 to 6 cups vegetable or peanut oil, (for frying)
• 1 large egg
• ½ cup milk
• 1½ cups all-purpose flour
• 3 tablespoons cornstarch
• 1½ teaspoons baking powder
• ¾ teaspoon garlic powder
• 1 tablespoon freshly ground black pepper
• 1 teaspoon Accent flavor enhancer ((see note))
• 1 teaspoon paprika
• ½ cup mayonnaise, (best-quality such as Hellmann's or Duke's)
• 3 tablespoons store-bought barbecue sauce
• 2 teaspoons Dijon mustard
• 6 hamburger buns
• Bread and butter pickles