Butter a 9x13 inch pan. Heat sugar and syrup in the microwave on high ... butter and peanuts. Mix well. Add Chex cereal and mix. Press into the pan. Cool and cut.
Grease 9"x13" pan. Heat sugar and syrup in large bowl in microwave ... butter and peanuts; mix well. Add Rice Chex and gently mix. Pour into greased pan. Cool and cut.