Yum Cookie Bars
["6 Tbsp. butter or margarine", "3/4 c. packed light brown sugar", "1 egg", "1 Tbsp. milk", "1 tsp. vanilla", "1 c. all-purpose flour", "1/2 tsp. baking soda", "1/8 tsp. salt", "1/2 coarsely chopped nuts (optional)", "1 3/4 c. chocolate chips (10 oz. bag)"]
["Heat oven to 350\u00b0.", "Grease square pan (9 x 9 x 2). Cream butter and brown sugar in large mixer bowl until light and fluffy. Add egg, milk and vanilla. Beat well."]
["butter", "brown sugar", "egg", "milk", "vanilla", "flour", "baking soda", "salt", "nuts", "chocolate chips"]