INGREDIENTS
For the cookie bars:
1 cup
unsalted butter, at room temperature
2 cups
sugar
4
large eggs
2 tsp
vanilla extract
1
vanilla bean, split lengthwise
Zest from 1 lemon
5 cups
all-purpose flour
1 tsp
salt
1/2 tsp
baking soda
For the frosting:
1 cup
unsalted butter, at room temperature
1 tsp
vanilla extract
salt
4 cups
confectioners’ sugar, sifted
5 tbsp
milk
Food coloring (optional)