Line 9×13 pan with 15 whole graham crackers.
Filling: Boil together for 8-10 min:
1 c. br. sugar
1/2 c. butter
1/2 c. milk
Pour this on top of crackers.
Cover with 1 c. crushed graham crackers crumbs and 1 c. flaked coconut.
Top with another 15 graham crackers.
Frost with powder sugar frosting if desired.