Making Sour Cream Biscuits is a straightforward process. Just follow these easy steps:

1. Preheat the Oven: Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.
2. Combine Dry Ingredients: In a large mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and sugar (if using).
3. Add Butter: Cut the chilled butter into the flour mixture using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
4. Incorporate Sour Cream: Stir in the sour cream gently until just combined. Be careful not to overmix.
5. Knead the Dough: On a lightly floured surface, turn the dough out and knead gently 3-4 times until it comes together.
6. Roll Out: Using a rolling pin, gently roll the dough to about 1-inch thickness.
7. Cut Biscuits: Use a biscuit cutter to cut out rounds of dough. Place them on the prepared baking sheet, slightly touching.
8. Brush with Milk: Brush the tops of the biscuits with milk to create a golden crust.
9. Bake: Place the baking sheet in the oven and bake for 15-20 minutes or until golden brown and fluffy.
10. Cool and Serve: Allow the biscuits to cool slightly before serving warm.

These simple steps will guide you through creating your fluffy Sour Cream Biscuits seamlessly.