Whole wheat biscuits

Mix 1 cup flour,1 cup whole wheat flour,1 tablespoon baking powder,1 tsp salt, and 1 tsp sugar. Add 1/4 pound butter and mix again. With the mixer is still running, add 3/4 cup half-and-half milk.Roll the dough until into a 3/4-inch thick circle. Cut into 2 1/2 inches diameter circles. Put them on a lined cookie sheet. Brush with the egg wash(1 egg mixed with 1 tablespoon water). Bake at 400 degrees Fr 20 minutes.