INGREDIENTS
3/4 cup
unsalted butter, room temperature and cubed
2 1/2 cups
confectioners sugar, sifted
6
egg whites (you can save the yolks to use later or discard them entirely)
2 tsp
vanilla extract
1/4 tsp
lemon zest
2 cups
all-purpose flour
1/2 cup
Nutella (or more, if needed)