Berry Good Thumbprint Cookies
["1/2 c. shortening, softened", "1/2 c. butter, softened", "1/2 c. brown sugar", "2 egg yolks", "1 tsp. vanilla", "2 c. flour", "1/2 tsp. salt", "strawberry or raspberry jam", "2 beaten egg whites", "1 c. finely chopped walnuts"]
["Preheat oven to 375\u00b0.", "In a large mixing bowl, cream together shortening, butter and brown sugar.", "Add egg yolks and vanilla; blend well.", "Add 2 cups flour (one cup at a time) and salt. Combine until a soft dough forms.", "Roll into 1-inch balls.", "Dip into beaten egg whites; roll in chopped walnuts.", "Place 1 inch apart on an ungreased cookie sheet.", "Bake cookies 5 minutes. Remove from oven; quickly, but gently press thumb into top of each cookie.", "Return to oven; bake 8 minutes longer.", "Cool on a wire rack.", "Place a scant teaspoon of jam in each thumbprint."]
["shortening", "butter", "brown sugar", "egg yolks", "vanilla", "flour", "salt", "strawberry", "egg whites", "walnuts"]