Add the cheese, seasonings, and egg. Mix it until it’s well incorporated.
Place half the batter in the mini waffle maker and cook it for 4 minutes.
If you want a crunchy bread, add a tsp of shredded cheese to the mini waffle iron for 30 seconds before adding the batter. The extra cheese on the outside creates the best crust!
After the first chaffle is complete, add the remaining batter to the mini waffle maker and cook it for 4 minutes.
Add the mayo, Dijon mustard, roast beef and cheeses to your sandwich.
Extra step worth doing but optional:
You care going to make this sandwich just like you would a grilled cheese sandwich. This will melt the cheeses and heat the roast beef.
Heat a small frying pan and place a teaspoon of butter in it. Once the butter has melted add the prepared chaffle sandwich.
Cook on each side for about 2 to 3 minutes or until the cheese has melted.