01 -
Prepare a large piping bag fitted with a 1/4" diameter round tip. Line two baking sheets with parchment paper or silicone mat.
02 -
Sift powdered sugar, almond flour, and pistachio flour together and set aside.
03 -
Place a bowl over a pan with barely simmering water, ensuring the bowl doesn't touch the water. Add sugar and egg whites to the bowl. Whisk until frothy and sugar is completely melted, about 2 minutes. Test by rubbing mixture between fingers - it should feel smooth without sugar granules.
04 -
Transfer syrup to a stand mixer. With whisk attachment, start on low for 30 seconds, then increase to medium speed for 1-2 minutes until white and fluffy. Raise to high speed and whisk until stiff peaks form. Look for glossy texture with streaks formed by the whisk.
05 -
Pour sifted dry ingredients into the meringue. Add green food coloring if desired. Fold gently in a J-motion until batter reaches proper consistency - it should flow like lava and form a figure 8 without breaking when lifted with spatula. When batter falls off spatula slowly but continuously, it's ready.
06 -
Transfer batter to piping bag. Pipe directly perpendicular to the baking sheet, applying gentle pressure for about 3 seconds before pulling up with a slight twist. Bang trays against counter several times to release air bubbles. Use a toothpick to pop any visible bubbles on the surface.
07 -
Allow shells to rest 20-40 minutes depending on humidity. They're ready to bake when the surface feels dry to a gentle touch.
08 -
Preheat oven to 300°F (150°C). Bake one tray at a time for 5 minutes, rotate, bake 5 more minutes, rotate again, and continue baking for a total of 15-20 minutes. Macarons are done when they have a deeper color, formed feet, and don't feel jiggly when gently touched.
09 -
Beat butter and cream cheese at medium speed for 1 minute. Add sifted powdered sugar and mix on low to combine. Add pistachio flour and vanilla. Cream for another minute until fluffy. Transfer to piping bag.
10 -
Pipe about 1 teaspoon of filling onto each bottom shell and sandwich with another shell. Drizzle with melted white chocolate and sprinkle with ground pistachios to finish.