Here's the recipe:

1 cup butter, softened
1 cup white sugar
2 eggs
1 teaspoon vanilla extract
3 3/4 cups all-purpose flour
2 teaspoons baking powder
1/4 cup heavy whipping cream
1/2 cup colored sugar for decoration

1 In a medium bowl, cream together the butter and sugar. Stir in the eggs and vanilla. Sift together the flour and baking powder, stir into the creamed mixture alternately with the heavy cream. Cover dough, and chill for 2 to 3 hours, until firm.

2 Preheat oven to 350 degrees F (175 degrees C).

3 On a lightly floured surface, roll out the dough to 1/4 inch thickness. Cut into desired shapes with cookie cutters. Place cookies 1 inch apart on the cookie sheets.

4 Bake *just* until set (5-6 minutes in my oven when I make round cookies 1.5 inches wide). Do NOT wait until cookies turn golden brown, they will be too dry. I also only bake on a stone, not sure how these turn out when baked on metal.

I have the frosting recipe at home, but from memory, I think this is it:

1/4 cup butter, softened
4 cups powdered sugar
2 egg whites
1 tsp vanilla
1/4 tsp cream of tartar
1-2 Tbsp whole milk
Food coloring

Combine butter and sugar. Add unbeaten egg whites, vanilla and cream of tartar. Add milk and food coloring until almost runny consistency. Dip tops of cookies in icing and place on rack to dry. Icing will dry to a smooth, shiny, firm finish.

via Sherri