Whisk eggs, milk, powdered sugar, and salt in a mixing bowl and set aside
Prepare the French toast:
Spread 1 tsp of mayo on one side of the bread and another 1 tsp on another slice. Repeat with the other pair
Place one slice of cheese on the mayo side, top with a few slices of pickles and then top with another slice of bread
Cut each sandwich into 4 squares. So you have a total of 8 squares
You can prepare ahead up to this point and only prepare the egg mixture when you are ready to cook and serve them. Read the make-ahead tips in my post above for more details
Cooking:
Dip one square into the egg mixture. Make sure it's coating all sides. Let them sit for about 10 minutes to absorb the egg mixture
Melt butter in a large non-stick pan. Swirl the pan to coat the base.
Place the French toast pieces in the pan and cook over medium heat for about 2 minutes on each 4 sides.
They should be nicely golden brown
To serve:
Serve them warm with drizzle of maple syrup and chili crisp if you wish too.