a 3-inch round cookie cutter; a 3/4- to 1-inch-wide star or round cookie cutter
Preheat the oven to 350 degrees F and line 2 baking sheets with parchment.
In the bowl of a stand mixer, cream together the butter, sugar and salt until pale and fluffy, about 3 minutes. Beat in the egg and vanilla and almond extracts. Gradually mix in the flour until combined.
Turn the dough out onto a lightly floured surface. (Alternatively, you can divide it in half, wrap it in plastic wrap and refrigerate it for up to 2 days before proceeding to the next step.) Roll out the dough until it's 3/16 inch thick. Cut out twelve 3-inch circles using a cookie or biscuit cutter. Use a 3/4- to 1-inch-wide star cookie cutter or smaller circle to cut out a hole in the center. Place the cookies on one of the prepared baking sheets. Reroll the dough and cutouts and punch out 12 more 3-inch circles. Place the circles on the second baking sheet.
Bake the cookies until set but still pale, about 10 minutes. Cool completely on a wire rack.
In a double boiler, melt the white chocolate chips. Stir in the pistachios and a drop of green food coloring, if desired.
Once the cookies are cool, spread a thick layer of the white chocolate in the center of a cookie and then squish into a sandwich with one of the cutout cookies. Sprinkle the center with additional pistachios and/or sprinkles, if using. Repeat with the remaining cookies. Let stand at room temperature or in the fridge until set, about 5 minutes.