Sift together powdered sugar, almond flour, and cocoa powder into a bowl to remove lumps.
Using a chilled, clean bowl, whip the egg whites at room temperature until they begin forming soft peaks.
Slowly add granulated sugar to the egg whites while continuing to whip until stiff, glossy peaks form.
Mix vanilla paste and red food gel carefully into the meringue to combine flavor and color evenly.
Fold the dry ingredients gently into the meringue using a spatula until the batter flows smoothly.
Line a baking tray with parchment paper and pipe the batter into consistent round shapes.
Allow the piped macarons to rest at room temperature for 30 to 60 minutes until a skin forms on top.
Heat the oven to 150°C (300°F) and bake the macarons for 15 to 20 minutes until set.
Whip the chilled heavy cream and granulated sugar together until soft peaks appear.
Fold the cold mascarpone and vanilla paste into the whipped cream until the frosting is smooth.
Spread or pipe the mascarpone frosting onto one macaron shell and sandwich with another to assemble.