Chop/break chocolate bar into 1/2" pieces and combine them in microwave safe bowl. Measure out cornflakes and put them in a mixing bowl.
Heat chocolate on medium level for 1 minute (I heat mine on level 5, with level 10 being the highest). Heat chocolate on high level for 30s, removing every 30s to stir until chocolate is completely melted. Once chocolate is completely melted, pour over cornflakes.
Gently mix with spatula. Don't worry if some of the cornflakes break, as they will. Continue mixing until all the cornflakes are completely coated with chocolate
Scoop chocolate covered cornflakes into regular muffin tins, filling about 3/4 full. (One batch makes about 18 servings)**
Allow to chill for 30 minutes in refridgerator
Remove from muffin tin and enjoy straight out of the fridge. Store in airtight container in fridge at all times.