1. In a large bowl, mix the cereals, pretzels and pecans. Sprinkle toffee bits on top of the cereal mixture.
2. In a small microwavable bowl, stir coffee granules and water until coffee is dissolved. Add Chocolate chips and butter. Microwave uncovered on High 1 1/2 minutes, stirring after 1 minute, until mixture is smooth. Pour over cereal mixture; stir until evenly coated. Pour in 2 gallon food storage plastic bag.
3. Add powered sugar. Seal bag; shake evenly until well coated. Spread on wax paper or foil to cool. Store in airtight cotainer.