Easter Egg Sugar Cookies with Marbled Royal Icing

INGREDIENTS

3 cups

all-purpose flour

2 tsp

baking powder

1 cup

unsalted butter (softened)

1 cup

granulated sugar

1 tbsp

freshly grated lemon zest

1 tsp

vanilla extract

large egg (room temperature)

Royal Icing Ingredients:

1 lb

confectioner's sugar (4 cups)

3 tbsp

meringue powder

1 1/2 tsp

vanilla extract

1/3 cup

warm water