Flaky Biscuits with a Million Layers of Cinnamon

Preheat oven to 425 degrees F. Line baking sheet with parchment paper, silicone baking mat or lightly grease.Place dry ingredients together in food processor bowl. Pulse 3 times.Add cold butter and shortening, sliced into small pieces. Pulse 8 times to cut into flour until you have pieces of various sizes resembling oatmeal, peas, and cornmeal all mixed together.Pour whey over mixture and pulse about 8 times just until mixture starts to stick together.Turn out onto floured surface. (I like to use a silicone baking mat because clean-up is easy in the dishwasher.)Knead about about 3-4 times until you have a cohesive ball of dough. Use your hands to gently push dough into a square shape.Use a rolling pin to roll out dough about ½ inch thick. Sprinkle cinnamon-sugar mixture over â…” of the dough. (I like to execute one quick spritz of water on top of the cinnamon to help the layers stick together. Fold uncoated third of the dough over on top of the cinnamon layer and then the other third on top of that one. See picture. Repeat process one or two more times.Roll dough to ½ inch thick and cut into 12 squares with a sharp knife. Use a greased cookie sheet or one covered with parchment paper or silicone mat.Slice into 12 biscuits and use tip of sharp knife to lift onto prepared pan.Brush with melted butter if desired and sprinkle with regular or sanding sugar.Bake at 425 for 5 minutes. Reduce temperature to 400 degrees for another 12 minutes.