Heat oil in a deep pot to 365–375°F.
Mix flour, salt, pepper, garlic powder, and paprika in a bowl.
In another bowl, whisk egg and water.
Dredge chicken in flour, dip in egg, then coat again in flour.
Fry chicken in batches for 8–10 minutes until golden and cooked through.
Transfer to paper towels to drain.
Preheat oven to 425°F.
Combine flour, baking powder, salt, and baking soda.
Cut in cold butter until crumbly.
Add buttermilk and mix until dough forms.
Roll out, cut biscuits, and bake for 12–15 minutes.
Brush with melted butter.
Heat honey with red pepper flakes, then stir in vinegar.
Assemble hot honey chicken biscuits by placing fried chicken inside warm biscuits and drizzling with hot honey.