Graham Cracker Crunch Cake

1 cup gram gracker crumbs
¼ cup packed brown sugar
1/3 cup margarine or butter
1/3 cup flaked coconut
1 pkg. Betty Crocker golden vanilla cake mix
1 tub Betty Crocker Creamy Deluxe chocolate frosting

Heat oven 350°. Grase and flour 2 round pans, 9x1½". Mix
graham cracker crumbs and brown sugar in lrg. bowl. Cut
in margarine with fork until mixture is crumbly. Stir
in coconut, sprinkle ievenly in pans. Prepare cake mix
as directed on package. Divide batter evenly between
pans. Bake 28 to 30 min. or until cake springs back when
touched lightly in center. Cool 10 min.. Invert on wire
rack; remove pans. Cool cake completely. Stack layers
with graham cracker sides in center. Frost sides and top
of cake with frosting. Garnish with coconut or nuts if
desired