Buttermilk Biscuits
Preheat oven to 425. In large bowl, sift together 2 cups flour, 1 Tbsp baking powder, ¾ tsp salt, and ½ tsp baking soda. Using 2 knives (or pastry cutter), cut 5 Tbsp chilled solid butter into flour mixture until course crumbs form. Add 1 cup buttermilk (I reconstituted powdered buttermilk), tossing with fork until dough forms.
Turn out onto lightly floured surface. Gather into disk. Knead lightly a few times, just until smooth. (Can be made up to 2 hours ahead, wrapped in plastic wrap, and refrigerated until ready to use.)
Pat the dough into a square, ¾-inch thick. Cut into square-shaped biscuits with a floured knife. (I used a glass and made round biscuits.) Bake 12-15 minutes on ungreased baking sheet.
For flaky biscuits, don’t overhandle dough.
This made 8 or 9 large biscuits in about 30 minutes, start to finish. We all enjoyed them, and I think I'll try Attempt #2 in the morning!