Preheat oven to 350ºF. Prepare cookie sheets with parchment paper or silpat.
Combine butter and powdered sugar until smooth.
Add egg, vanilla, and almond extracts, and combine well.
Mix flour, salt, and baking powder together in a separate bowl, and gradually add to butter and sugar mixture.
Add 7-10 drops of food coloring, mixing to combine.
Separate dough into balls, about a tablespoon each, and roll into finger-sized logs, tapering slightly at one end.
Using a toothpick, press lines into cookies to create “knuckles”.
Press an almond slice into the tapered end of cookie.
Bake for 10-12 minutes until set, removing before cookies begin to brown.
When cookies have cooled, lift almond fingernail, squeeze red piping gel into “nail bed”, then replace almond “nail” to squeeze gel up around it.