Chocolate-Coconut Slices
["Coconut Filling (recipe follows)", "6 Tbsp. butter, softened", "1 c. sifted powdered sugar", "1 egg", "2 (1 oz.) sq. unsweetened chocolate, melted and cooled", "1 tsp. vanilla", "1 1/2 c. flour", "1/2 tsp. baking soda", "1/2 tsp. salt"]
["Prepare Coconut Filling and chill.", "Cream butter and sugar. Blend in egg, chocolate and vanilla.", "Stir together flour, soda and salt; stir into creamed mixture.", "Chill 30 minutes."]
["Coconut Filling", "butter", "powdered sugar", "egg", "unsweetened chocolate", "vanilla", "flour", "baking soda", "salt"]