Preparation (24-48 Hours Before)
Separate eggs carefully (no yolk). Place 100g egg whites in a clean bowl, cover loosely with plastic wrap, and refrigerate uncovered for 24-48 hours.
Day of Baking
Take aged egg whites out of refrigerator 2 hours before starting to bring to room temperature (65-70°F).
Combine almond flour and powdered sugar. Sift twice through fine-mesh sieve, discarding any large pieces.
Preheat oven to 300°F (150°C) with rack in center position.
Line baking sheets with parchment paper or silicone mats. Place circle templates (1.5 inches) underneath parchment.
Prepare piping bag with ½-inch round tip.
Make Italian Meringue
Combine 50g granulated sugar and 40g water in small saucepan. Heat over medium heat without stirring.
When syrup reaches 230°F (110°C), start whipping 50g egg whites with pinch of salt in stand mixer on medium speed.
When syrup reaches 245°F (118°C), remove from heat immediately.
With mixer on medium speed, slowly pour hot syrup down side of bowl into whipping egg whites, avoiding the whisk.
Increase speed to high and whip for 8-10 minutes until meringue is thick, glossy, and cooled to room temperature (bowl feels barely warm).
Add vanilla extract and gel food coloring in last 30 seconds of mixing.
Make Macaron Batter (Macaronage)
Add remaining 50g egg whites to sifted almond flour and powdered sugar mixture. Mix briefly to form thick paste.
Add ⅓ of Italian meringue to almond paste. Fold vigorously with spatula to lighten mixture.
Add remaining meringue in two additions, folding gently using "J" motion: scrape down side, cut through center, fold over.
Test consistency: Lift spatula and let batter ribbon down. It should flow like lava, forming ribbon that disappears back into batter within 10-15 seconds. If it holds shape longer, fold 2-3 more times.
Pipe and Rest
Transfer batter to prepared piping bag.
Hold bag vertically ½ inch above parchment. Pipe in steady circles to fill 1.5-inch template guides.
Stop piping, then quickly lift straight up with small twist to avoid peaks.
Lift tray 2 inches and drop firmly on counter 5-6 times. Rotate and repeat to release air bubbles.
Use toothpick to pop any visible surface air bubbles.
Let piped shells rest at room temperature for 30-60 minutes until skin forms. Touch test: finger should come away clean without batter sticking.
Bake
Bake one tray at a time for 12-15 minutes. Shells should not brown.
Doneness test: Gently touch top of shell—it should not wobble or slide on base. If it wobbles, bake 1-2 minutes longer.
Let cool completely on baking sheet (10 minutes), then peel off parchment gently.
Make Vanilla Buttercream
Beat softened butter on medium-high speed for 3 minutes until fluffy and pale.
Add sifted powdered sugar ½ cup at a time, beating after each addition.
Add heavy cream, vanilla extract, vanilla bean paste, and salt. Beat 2-3 minutes until light and smooth.
Transfer to piping bag fitted with small round or star tip.
Assemble
Match shells by size, flipping half upside-down.
Pipe small mound of buttercream (about 1 teaspoon) on flat side of upside-down shells.
Sandwich with matching top shell, pressing gently to spread filling to edges.
Refrigerate assembled macarons in airtight container for 24 hours before serving (maturation period).