Preheat oven to 375°F. Leave baking sheets ungreased and cool; do not line with parchment.
Cream butter and sugar on medium speed until pale and fluffy, about 2 to 3 minutes.
Beat in egg, vanilla, almond extract, and salt until smooth.
Whisk flour with baking powder. Add to the mixer in two additions, mixing just until a soft dough forms.
Assess dough; if too firm for the press, mix in milk 1 teaspoon at a time until pliable.
Load dough into a cookie press fitted with your chosen disk. Press shapes 1 inch apart onto cool, ungreased sheets.
Sprinkle with sanding sugar or sprinkles.
Bake each sheet 7 to 9 minutes until edges are set but not browned.
Cool on the sheet for 2 minutes, then transfer cookies to a rack to cool completely.