01 -
Double-sift the confectioners' sugar with almond meal to remove lumps and make sure everything mixes well.
02 -
Using a clean bowl, beat the egg whites till they're foamy, then add in the cream of tartar. Slowly pour in white sugar while beating until you get stiff, shiny peaks. Add green food coloring until you get the tree-like color you want.
03 -
Carefully fold the dry mix into the egg whites bit by bit. Keep folding until the batter runs off your spatula like thick honey and settles back into itself within about 10-15 seconds, kinda like flowing lava.
04 -
Spoon the batter into your piping bag with a round tip. Pipe out tree shapes or simple circles on baking sheets lined with parchment. Bang the trays on your counter a few times to pop air bubbles. Let the shells sit out uncovered for 30-60 minutes till they form a dry surface.
05 -
Heat your oven to 300°F. Bake each tray one at a time for about 14-16 minutes, turning halfway through cooking time, until the shells come off the paper cleanly. Let them cool totally before you put them together.
06 -
With a mixer, whip the softened butter until it's light and fluffy. Mix in the confectioners' sugar, vanilla, heavy cream, and salt until smooth. Gently mix in the crumbled snack cakes. Put this filling into a piping bag.
07 -
Match up shells that look about the same size. Squeeze some filling onto the flat side of one shell, then lightly press another shell on top to make a sandwich cookie.
08 -
Drip some melted white chocolate over your macarons, add fun sprinkles, and stick a gold star on top of each tree shape if you want.