Preheat the oven to 425°F. Line a baking sheet with parchment paper or a silicone baking mat. (You can also use a cast iron skillet). Set aside.
In a large bowl, whisk together the flour, sugar, baking powder, salt, and baking soda.
2 cups all purpose flour, spooned and leveled, 1 Tbsp. granulated sugar, 1 Tbsp. baking powder, 1 tsp. kosher salt or 3/4 tsp. fine salt, 1/4 tsp. baking soda
Cut in the butter using a pastry blender until pea-sized pieces form.
1/2 cup cold, unsalted butter
Whisk together the sour cream and buttermilk in a small bowl and then add to the dry ingredients, mixing gently until a shaggy dough forms. Do not over-mix.
1/2 cup cold buttermilk, 1/2 cup cold sour cream, full-fat
Turn the dough out onto a lightly floured work surface, like a cutting board, and gently pat it into a rectangle, it should be about 1 inch thick. Don’t add more liquid, you’ll be tempted, but it will come together in the next step. Using a knife or bench scraper, cut the dough into 4 sections. Stack each quadrant on top of each other and press down to flatten. Use a rolling pin to roll the dough out into a 1 inch thick rectangle.
2 options to cut the biscuits. Option 1. Cut into squares using a knife, this method is great because you’ll have no scraps. Just be sure to cut straight down and don’t use a back-and-forth sawing motion. Option 2: Cut into rounds using a 2 ½ inch round biscuit or cookie cutter, press straight down, and avoid twisting or jiggling the cutter. Press the leftover dough back together if desired to cut a couple more biscuits, but try not to work with the dough and re-roll it too much because this leads to tough biscuits. This is small batch, you should get about 4-6 round biscuits.
Place the biscuits on a baking sheet with the sides touching each other. Freeze biscuits for 10-15 minutes.
Brush the tops of the biscuits with the melted butter.
2 Tbsp. butter, melted, unsalted
Reduce the oven temperature down to 400°F. And bake for ~14 minutes or until the tops are golden brown and the biscuits are cooked through. YUM!