Oatmeal chocolate clusters

1 6-ounce package unsweetened chocolate chips
1/3 cup butter
16 large marshmallows
1/2 teaspoon vanilla
2 cups oats
1 cup flaked coconut

Heat chocolate chips, butter and marshmallows in 3-quart saucepan over low heat. Stir constantly until smooth; remove from heat. Mix in vanilla, oats and coconut. Drop mixture by teaspoonfuls onto wax paper and shape into clusters with hands. Refrigerate before serving.