Preheat the oven to 350 degrees F.
Start with Alton's Sugar Cookie Dough recipe.
On a work surface, knead the flour into the Sugar Cookie Dough until well combined. Add chopped almonds and almond extract and knead dough until evenly incorporated.
Scoop level tablespoons of dough and roll into smooth balls between the palms of your hands. Place balls about 1 inch apart on a parchment-lined baking sheet and chill for 20 minutes. Bake until set and golden on the bottom, about 12-14 minutes. Let cool 10 minutes on the baking sheet. Stir the confectioner's sugar and sanding sugar together in a shallow dish.
While cookies are still warm, roll in sugar mixture with a fork until completely coated, gently pressing cookies into mixture to adhere the sanding sugar. Transfer to a rack to cool completely.
Sift together flour, baking powder, and salt. Set aside. Place butter and sugar in large bowl of electric stand mixer and beat until light in color. Add egg and milk and beat to combine. Put mixer on low speed, gradually add flour, and beat until mixture pulls away from the side of the bowl. Divide the dough in half, wrap in waxed paper, and refrigerate for 2 hours.
Preheat oven to 375 degrees F.
Sprinkle surface where you will roll out dough with powdered sugar. Remove 1 wrapped pack of dough from refrigerator at a time, sprinkle rolling pin with powdered sugar, and roll out dough to 1/4-inch thick. Move the dough around and check underneath frequently to make sure it is not sticking. If dough has warmed during rolling, place cold cookie sheet on top for 10 minutes to chill. Cut into desired shape, place at least 1-inch apart on greased baking sheet, parchment, or silicone baking mat, and bake for 7 to 9 minutes or until cookies are just beginning to turn brown around the edges, rotating cookie sheet halfway through baking time. Let sit on baking sheet for 2 minutes after removal from oven and then move to complete cooling on wire rack. Serve as is or ice as desired. Store in airtight container for up to 1 week.