Place 1 cup of Reese's Peanut Butter chips in a microwave safe container. Microwave at half power for 30 seconds, remove container and stir. Repeat this process until all chips are melted. (Be sure to check it regularly, chips will burn in the microwave.)
Add 4 cups of Chex cereal into a bowl. Once chips are melted, pour the melted chips into the bowl with the Chex cereal. Fold until all cereal is coated. (This process may take a few minutes.)
Place 1/2 cup of Betty Crocker Fudge Brownie Mix in a gallon zip top bag and add 1 tablespoon of sugar. Mix well.
Remove peanut butter coated Chex cereal from bowl and put into bag with brownie mix and sugar. Seal the bag and shake well. All the cereal needs to be covered.
Line a baking tray with wax paper, pour the muddy buddies onto the tray evenly.
Allow the muddy buddies to dry completely then add in some Reese's Peanut Butter Minis if desired.
NOTE: Be sure to store in an airtight container. Recipe makes approximately 8 half cup servings.