Koulourakia(Greek Cookies)  
["1/2 lb. unsalted butter", "1/2 c. sugar", "3 c. sifted flour", "2 tsp. baking powder", "2 eggs", "1 tsp. vanilla", "sesame seed (optional)"]
["Whip butter and cream together with sugar. Add baking powder to flour. Add to butter mixture. Mix in eggs and vanilla. Shape into braids/twists. Sprinkle sesame seed. Brush tops with egg yolk beaten with 1 teaspoon of water. Bake at 350\u00b0 for 20 to 25 minutes or until golden brown."]
["unsalted butter", "sugar", "flour", "baking powder", "eggs", "vanilla", "sesame"]