In a bowl, combine chicken pieces and pickle juice. Cover and refrigerate for 30 minutes to 1 hour. Drain and pat dry.
In one bowl, whisk milk and egg. In another, mix flour, powdered sugar, salt, pepper, paprika, garlic powder, and baking powder.
Dip each piece of chicken into the milk mixture, then dredge in the flour mixture, making sure to coat evenly.
Heat peanut oil in a deep skillet or pot to 350°F (175°C). Fry the nuggets in batches for 3-4 minutes per side, until golden brown. Drain on paper towels.
In a small bowl, whisk together mayonnaise, honey, mustard, BBQ sauce, and lemon juice until smooth.
Serve the crispy, golden nuggets warm with homemade Chick-fil-A sauce!