Maple Bars
["1 c. butter", "1 c. brown sugar", "1 egg yolk, beaten", "2 c. sifted flour", "3 drops maple flavoring", "1/2 tsp. vanilla", "1 (8 oz.) pkg. chocolate chips"]
["Cream butter and sugar together; add egg yolk and beat.", "Add flour and mix.", "Add maple flavoring and vanilla; mix well.\tSpread on cookie sheet and bake at 325\u00b0 to 350\u00b0 for 15 minutes.", "Remove from oven and cover with chocolate chips.", "Place in oven for about 1 minute or until chocolate melts and can be spread."]
["butter", "brown sugar", "egg yolk", "flour", "vanilla", "chocolate chips"]