01 - Line two baking sheets with parchment paper or silicone mats. Fit a pastry bag with a 1/2-inch round tip and set aside.
02 - Sift almond flour and powdered sugar together into a bowl until thoroughly combined. Set aside.
03 - In a clean, dry bowl, beat egg whites and cream of tartar until soft peaks form. Gradually add granulated sugar while beating, continuing until stiff, glossy peaks form.
04 - Gently fold almond flour mixture into meringue in three additions. Optionally tint one-third of batter yellow for yolk effect. Mix only until batter flows in thick ribbons (proper macaronage consistency).
05 - Transfer batter to pastry bag. Pipe 32 rounds (about 1.5 inches diameter) onto prepared sheets. Firmly tap trays to release air bubbles. Let shells rest at room temperature for 30-60 minutes until surfaces are dry to touch.
06 - Preheat oven to 300°F. Bake for 13-15 minutes, rotating pans halfway through. Shells are done when they easily lift off the mat without sticking. Cool completely before filling.
07 - Heat heavy cream until just simmering. Pour over chopped milk chocolate and let stand for 2 minutes. Stir until completely smooth. Add golden syrup and butter, mixing until glossy and fully incorporated.
08 - Reserve one-quarter of the chocolate filling and tint with yellow gel coloring to create the 'yolk.' Refrigerate both fillings until thickened to pipeable consistency.
09 - Pipe a ring of chocolate filling onto one shell, then place a small dollop of yellow filling in the center. Gently sandwich with another shell, pressing lightly until filling reaches edges. Repeat with remaining components.
10 - Place assembled macarons in an airtight container and refrigerate overnight for optimal flavor development. Best consumed within 5 days.