Simultaneously, while working on marinating, dredging, and frying the chicken, make the biscuits. In a mixing bowl, add the flour, sugar, salt, baking powder, and baking soda. Whisk to combine, then scatter around chunks of butter into the flour mixture.
2 ¼ cups all-purpose flour , 2 tablespoons sugar, 1 tablespoon baking powder, 1.5 teaspoons kosher salt, ½ teaspoon baking soda, 8 tablespoons unsalted butter
Using a pastry butter or your fingers, work the butter into the flour mixture, until all of the butter is roughly the size of a pea or almond and the mixture looks a little sand-like. Don't overwork the mixture! Chunks of butter are good, and they will help the biscuits rise in the oven and become fluffy.
Pour in the buttermilk, and using a rubber spatula, stir until a shaggy mixture is achieved. It will be quite sticky. It won't come together all the way on its own yet -- that's okay, trust the process!
¾ cup buttermilk
Cover a work surface with more flour, then scoop the dough out of the bowl and onto the work surface. Press and pat the dough together gently until it is a rectangular shape.
¼-1/2 cup all purpose flour
Fold the right side of the rectangle over the left side using your hands or a bench scraper. Press gently together, it will be shaggy and messy still. Pat into a rectangle again, and turn the dough 90° before pressing it out into a rectangle shape again, and folding it in half once again. Fold the top half down to the bottom and press it out into a horizontal rectangle again.
Repeat the steps above 2 more times for a total of 6 folds. Work carefully and don't overwork the dough. Creating folds is what makes layers in the biscuits.
After 6 folds, gently pat the dough into a rectangle/square-shape that is about ¾-inch thick. Use a sharp circle biscuit cutter, or a bench scraper or sharp knife to create rectangular-shape biscuits. Press down through the dough quickly, then lift up. Don't twist the biscuit cutter or move it around, or you will seal the edges of the biscuits, and this will prevent it from rising properly. Just push down, then pull straight up. You will have 6-large biscuits.
Place the biscuits on a parchment lined baking sheet, giving them a bit of space to rise. Transfer them to the freezer for at least 30-minutes before baking, and preheat the oven to 400°F. The biscuits can be kept in the freezer in an airtight container for up to 3 months if you'd like to make them in advance and bake them on the day of.