To make this recipe in the microwave, combine all of the ingredients as directed above. Then instead of microwaving the Chex™ mix, spread it out in an even layer on a large parchment-covered baking sheet. Bake at 250°F for 1 hour, stirring every 15 minutes. Spread on paper towels to cool, and sprinkle with the fresh lime zest. Store in airtight container.