might not just be about pouring milk on cereal
First year cookery from something over 40 years ago (hence not el reg units of measure). And from memory.
4 ozs each of marg, soft toffee, marshmallow, and Rice Krispies.
Melt marg over low heat. Add toffee and marshmallow. Wait until they melt, then mix together. Add Rice Krispies and stir until coated. Pour mixture into swiss roll tin, spead out and chill. When set, turn out and cut into squares.