By using the double boiler method, whisk the eggs, cocoa powder, butter and condensed milk until it thickens.
Add in Kellogg's Mueslix and fold it in. Make sure evrything is well coated with the chocolate.
Pour it into a 7 inch baking pan that has been lined with parchment paper.
Press and flatten it, then let it rest in the refrigerator until it is set.