2 cups old fashioned oats
2 cups whole wheat flour
1 cup unsalted butter, cold, cut into pieces
13 cup dark brown sugar, packed
1 34 teaspoons baking powder
1 12 teaspoons salt
12 cup whole milk
Coarsely chop the oats in a food processor and transfer to a large bowl. Pulse together the flour, butter, brown sugar, baking powder and salt in the food processor until mixture resembles a coarse meal. Add milk and blend until mixture just forms a dough. Add the oats and knead until just incorporated. Halve the dough and pat each half into a 5 by 3-inch rectangle. Chill, wrapped well in plastic wrap, until firm, about 3 hours. Preheat the oven to 350F. Cut 1 rectangle cross-wise into scant 1/4 inch thick slices and bake on an ungreased large baking sheet in the middle of the oven until undersides are a shade darker, about 20 minutes. Transfer to a rack to cool and make more biscuits with the remaining rectangle of dough.