S'more Cookie Bars

1/2 cup butter, softened
1/4 cup brown sugar
1/2 cup sugar
1 egg
1 tsp. vanilla
1 1/3 cups flour
3/4 cup graham cracker crumbs (approx. 7 full graham crackers crushed)
1 tsp. baking powder
1/4 tsp. salt
2 super-sized (5 oz.) chocolate bars (I prefer milk chocolate)
1 1/2 cups marshmallow creme

In bowl, cream sugars and butter. Add egg and vanilla. Mix in baking powder, salt, graham cracker crumbs and flour until blended. Divide dough in half and press half into bottom of greased 8x8 pan. Place chocolate bars on top of dough. Two 5 oz. bars should fit perfectly but break chocolate if necessary in order to fit. Then, spread marshmallow creme over chocolate. Place other half of dough on top of creme. *Tip* - put dough in gallon size ziploc bag. Flatten dough with fingers then cut sides of bag to open like a book. Place over marshmallow, dough side down, and peel away bag.Bake at 350 degrees for 30 to 35 minutes. Cool before cutting into bars.