1 cup butter, softened, 1 cup sugar, 1 egg, 1 t. vanilla extract, 2 1/2 cups flour, 1/2 cup chopped pistachios, 1 jar (18 oz.) apricot preserves, (Additional chopped pistachios, optional).
In a small mixing bow, cream butter and sugar. Beat in the egg and vanilla. Gradually add flour. Stir in pistachios. Press into a greased 13" X 9" x 2: baking dish. Spread with preserves.
Bake at 350 degrees for 25 - 30 minutes or until edges begin to brown. Cool on a wire rack. Cut into bars. Garnish with additional pistachios if desired.