Besides the cookie dough ingredients, you will need:
3 cups flour
1/4 teaspoon baking powder
1/2 teaspoon salt
1 cup unsalted butter
3/4 cup sugar
1 egg
1 teaspoon vanilla
Mix the dry ingredients into the butter mixture. Do not overmix. Turn onto a floured surface and knead just until smooth. Too much working will make the cookies hard.
Roll out very thin ( 3/16 inch). Cut out the hearts or other shapes. (I like my butterfly and dragonfly cutters for these.)
Paint with egg white paint (recipe below) on the unbaked cut-out cookies and bake in 350 degree oven for about ten minutes.
Beat up 1 egg white in each container and add small amount of food coloring to each white.
Sprinkle with decor sugars if desired.