1. Cut butter with a sharp knife or pastry blender into 1/4-inch-thick slices. Sprinkle butter slices over flour in a large bowl. Toss butter with flour. Cut butter into flour with a pastry blender until crumbly and mixture resembles small peas. Cover and chill 10 minutes. Add buttermilk, stirring just until dry ingredients are moistened.
2. Turn dough out onto a lightly floured surface; knead 3 or 4 times, gradually adding additional flour as needed. With floured hands, press or pat dough into a 3/4-inch-thick rectangle (about 9 x 5 inches). Sprinkle top of dough with additional flour. Fold dough over onto itself in 3 sections, starting with 1 short end. (Fold dough rectangle as if folding a letter-size piece of paper.) Repeat entire process 2 more times, beginning with pressing into a 3/4-inch-thick dough rectangle (about 9 x 5 inches).
3. Press or pat dough to 1/2-inch thickness on a lightly floured surface; cut with a 2-inch round cutter, and place, side by side, on a parchment paper-lined or lightly greased jelly-roll pan. (Dough rounds should touch.)
4. Bake at 450° for 13 to 15 minutes or until lightly browned. Remove from oven; brush with 2 Tbsp. melted butter.
Note: For testing purposes only, we used White Lily Self-Rising Soft Wheat Flour.
Cinnamon-Raisin Biscuits: Omit 2 Tbsp. melted butter. Combine 1/2 cup golden raisins, 1/2 tsp. ground cinnamon, and 1/3 cup chopped pecans with flour in a large bowl. Proceed with recipe as directed. Stir together 1/2 cup powdered sugar and 2 Tbsp. buttermilk until smooth. Drizzle over warm biscuits. Makes 2 1/2 dozen.
Black Pepper-Bacon Biscuits: Combine 1/3 cup cooked and crumbled bacon slices (about 5 slices) and 1 tsp. black pepper with flour in a large bowl. Proceed with recipe as directed. Makes 2 1/2 dozen.
Feta-Oregano Biscuits: Combine 1 (4-oz.) package crumbled feta cheese and 1/2 tsp. dried oregano with flour in a large bowl. Proceed with recipe as directed. Makes 2 1/2 dozen.
Pimiento Cheese Biscuits: Combine 1 cup (4 oz.) shredded sharp Cheddar cheese with flour in a large bowl. Reduce buttermilk to 1 cup. Stir together buttermilk and 1 (4-oz.) jar diced pimiento, undrained. Proceed with recipe as directed. Makes 2 1/2 dozen.