1/2 c. butter
1 c. brown sugar
2 1/2 - 3 c. Rice Krispies
1/2 c. nuts
1 c. coconut

Bring butter and brown sugar to a boil. Remove from heat. Add Rice Krispies, nuts and coconut. Pour 1/2 of mixture in 9x9 pan. Cover with 1 quart vanilla ice cream. Put remaining mixture on top. Freeze. Top with chocolate if desired.