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1
Use a high-quality white bread such as Pain de Mie and trim off the crust.
2
Spread mayonnaise on the bread slices.
3
Layer the ham, cheddar cheese, and Swiss cheese between the bread slices, ensuring the fillings stay within the bread boundaries.
4
Press the sandwich gently to compress the layers and help them stick together.
5
Prepare the egg batter by whisking together egg yolk, whole egg, cream or milk, and a pinch of nutmeg until completely smooth and well combined.
6
Heat the clarified butter to approximately 225°F in a frying pan. Clarified butter is used because it can tolerate higher temperatures without burning, unlike regular butter which contains milk solids.
7
Dip both sides of the sandwich into the egg batter, making sure to coat evenly.
8
Carefully place the egg-dipped sandwich into the hot clarified butter. Cook patiently at a controlled temperature until each side becomes golden brown, then flip to cook the other side.
9
Once both sides are golden brown, transfer the sandwich to a baking sheet lined with parchment paper and bake in a preheated 375°F oven.
10
Bake for 10 to 15 minutes until the interior is heated through and the cheese is fully melted.
11
Remove from the oven and let cool briefly, then cut diagonally. Serve with fries or a salad on the side.