Secret Cookies

It's been a secret - but the cat is out of the bag, now! Here for safekeeping. From Food 52.

• Ready In: 25 mins
• Serves: 20
• Yields: 80 Cookies

Ingredients

• 3⁄4 lb salted butter, softened
• 1 3⁄4 cups sugar
• 2  egg yolks
• 2  teaspoons vanilla extract
• 3 1⁄2 cups flour
• 2  tablespoons sugar, Red, green, multi-colored (appox.)

Directions

1. Preheat oven to 350 degrees.
2. In a mixer fitted with a paddle attachment, cream the butter and sugar. Add the yolks and vanilla, mixing well. Add the flour and mix thoroughly.
3. Use mounded teaspoonfuls and make balls of dough with your hands. Place on an ungreased cookie sheet, then flatten the dough with the bottom of a patterned glass dipped in colored sugar (don't mix the red and green!).
4. Bake for about 10 minutes (watch carefully as they burn easily), until the cookies are lightly golden just around the edges. Let the cookies rest on the baking sheets for a minute or two and then gently transfer to baking racks to cool -- they're fragile.