Mix first five ingredients in a 3 litre casserole. Cover tightly and microwave on high to boiling, 2.5 to 3 minutes or longer depending on wattage of microwave; stir; Fold in cereal until completely coated with chocolate, fold in marshmallows. Press mixture evenly with buttered back of spoon in a greased baking pan 9 x 9. Let stand at room temperature about 1 hour. Cut into about 5 cm squares. == Courtesy of Dale & Gail Shipp, Columbia Md. ==