Preheat your oven to 375°F (190°C). Prepare two heavy-duty metal baking sheets. Do not line them with parchment paper and do not grease them! The dough needs a bare surface to grip.
In a large bowl, use a mixer to cream the softened unsalted butter and granulated sugar on high speed until light, pale, and very fluffy (about 3 minutes).
Beat in the room-temperature egg, vanilla extract, and almond extract until well combined and smooth.
If you are making green holiday trees, add a few drops of green food coloring to the wet mixture and blend until you reach your desired shade.
Turn the mixer to low speed and gradually add the all-purpose flour and salt. Mix just until a soft, pliable dough forms. Do not overmix.
Pack the soft dough firmly into the barrel of your cookie press, pushing out any large air pockets. Attach your desired decorative plate to the end.
Hold the press completely flat against the ungreased baking sheet. Squeeze the trigger once, then lift the press straight up. Repeat, spacing the cookies about 1 inch apart.
Decorate the raw pressed dough generously with colored sanding sugar or holiday sprinkles.
Bake for 7-9 minutes, or until the edges of the cookies are just barely beginning to turn golden brown.
Allow the cookies to cool on the hot baking sheet for 2 minutes to firm up, then use a thin spatula to transfer them to a wire rack to cool completely.