No bake puppy chow bars

Add the chocolate chips, peanut butter, butter and vanilla extract to a large microwave-safe bowl.
Heat them in the microwave for 60-90 seconds, or until everything has begun to melt. Remove the bowl from the microwave and stir until smooth.
Pour the Chex over the melted chocolate mixture and use a silicone spatula to gently stir until all of the Chex is completely coated in chocolate.

Line a 9x13 baking dish with parchment paper or aluminum foil.
Spread the puppy chow evenly throughout the pan.
Allow the bars to set in the fridge for 60-90 minutes or until the chocolate has completely set.
Remove the bars from the fridge and cut them into desired bar sizes.
Pour the powdered sugar into a small bowl and toss each bar in the sugar until it's completely coated. Store the puppy chow bars in the fridge.