Place the chicken thighs in a bowl and cover them with buttermilk. Let them soak for at least 30 minutes. This step helps keep the chicken tender and flavorful.
In another bowl, combine flour, cornstarch, paprika, garlic powder, onion powder, salt, and black pepper. Stir everything together until evenly mixed. This blend creates a crispy and flavorful crust.
Remove the chicken from the buttermilk and allow excess liquid to drip off. Press each piece into the seasoned flour mixture until completely coated. For extra crunch, repeat the coating process once more.
Combine self-rising flour, sugar, and salt in a large bowl. Cut the cold butter into the flour mixture until crumbly. Slowly add buttermilk and mix just until a dough forms.
Turn the dough onto a lightly floured surface and gently fold it several times. Roll it out to about one inch thick. Cut into biscuit rounds using a biscuit cutter.
Place the biscuits on a baking sheet and bake in a preheated 425°F (220°C) oven. Bake for about 12–15 minutes until golden brown. Allow them to cool slightly before assembling.
Heat vegetable oil in a deep skillet to 350°F (175°C). Carefully add the breaded chicken pieces and fry until golden brown and fully cooked. Transfer them to a wire rack to maintain crispiness.
Slice each biscuit in half horizontally. Place a crispy chicken thigh on the bottom half. Add any desired toppings and cover with the biscuit top.
Serve the biscuits while warm for the best flavor and texture. Enjoy them fresh with your favorite sides and sauces.