Combine buttermilk with first round of spices listed. Cut the chicken into strips and add to the buttermilk. Refrigerate overnight.
Preheat frying oil to 350 degrees F.
Combine the flour, cornstarch, baking powder, spices and salt and pepper to form a dredge. Add the chicken tenders to the dredge tossing to fully coat both sides. Transfer to a wire rack or tray to rest for 5 minutes before frying.
Fry until golden and crispy on both sides and in batches if needed. Roughly 4 minutes a side.
Place on wire rack and season with salt immediately after frying.
Bring the butter to a slow boil until completely clarified. About 10 minutes without stirring. Should be bright yellow and clear. Let stand a few minutes. If there is any foam or milk residue floating on top, remove with a spoon.
Combine clarified butter with lemon juice, lemon zest, salt, pepper and garlic powder.
Place the chicken tenders in a large bowl and add a few tablespoons of the lemon pepper butter. Toss to coat and add additional lemon zest, salt or pepper if desired.
Combine 2 tbsp of the remaining lemon pepper butter with mayonnaise. Mix well until combined to create a dipping sauce. Serve and enjoy!