Add in butter cubes. Use your hands to squish the butter into flat pieces in the flour mixture. Once all butter pieces are flattened, use pastry blender to incorporate butter into flour mixture. Continue blending until all butter pieces are pea-sized or smaller.
Add in buttermilk. Mix by hand until a soft dough forms.
Place dough onto lightly floured surface. Roll into a ½" thick rectangle.
Fold dough into thirds, then roll out into a longer ½" thick rectangle.
Fold dough into thirds again, starting on the short ends. This will make a rough square.
Use a dough cutter or sharp knife to trim the very edges of the square. This helps expose the layers inside and ensures all your biscuits rise evenly
Cut square into 9 equal squares. Place on parchment paper-lined baking sheet. Bake for approximately 15 minutes or until lightly browned. Brush tops with melted butter, if desired. Serve warm.
Notes
I live at about 5,000 feet above sea level. Altitude can affect how your biscuits rise. If you live at a lower elevation, you may need to increase the amount of baking powder in this recipe. If you live at a higher altitude, you may need to decrease the amount.
Using salted butter adds flavor and reduces the amount of additional salt needed. Cutting the butter into ½-inch cubes and incorporating it into the flour mixture by first squishing the butter, then using a pastry cutter creates pockets of fat that melt during baking, resulting in flaky layers
Buttermilk's acidity reacts with the baking powder to provide lift, contributing to the biscuits' fluffiness. It also imparts a subtle tang that enhances the overall flavor.
Use very cold ingredients. Keep your butter, buttermilk, and even flour chilled to get the best rise and flakiest texture.