ombine 2 cups flour with 2 tablespoon baking powder, ½ tablespoon sugar, and 1 teaspoon salt. Use a pastry cutter, your hands, or a food processor to blend in ¼ cup cold butter and 4 ounces cream cheese until the mixture resembles coarse sand. Stir in the chopped scallions and ¾ cup milk, mixing just until combined. Shape the biscuit dough into a square about 1 inch thick and cut into 4 pieces. Stack the pieces on top of each other and flatten again until the square is 1 inch thick. Wrap the dough in plastic and chill for 30 minutes.