Microwave the margarine, karo syrup, brown sugar and dash of salt for 2 minutes. Stir in vanilla, and baking soda. Pour mixture over chex cereal in a double brown paper bag. Shake and microwave for 1 min. Add pretzels and nuts and microwave for 1 min. Shake again. (If not evenly spread, microwave again) When done pour in m & ms.
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