Step 1:
Start by preparing your custard mixture. In a shallow bowl, whisk together the eggs, milk, a pinch of salt, and a dash of pepper. This is going to be your French toast base and it adds richness and structure to your sandwich.

Step 2:
If you haven’t already, cook your beef bacon until crispy. You can do this in a skillet over medium heat for about 6 to 8 minutes, flipping occasionally. Once done, set it aside on a paper towel-lined plate to drain excess grease.

Step 3:
Lay out your bread slices. On two of them, spread a thin layer of Dijon mustard if using. On the other two, spread the jam. This creates that magical sweet-and-savory combination.

Step 4:
Layer your sandwich. On one side, add a slice of Swiss cheese, then two slices of turkey, then two slices of beef bacon, then another slice of cheese. Close with the top slice of bread (jam side in), pressing gently.

Step 5:
Dip each sandwich into the egg and milk mixture, just like you would for French toast. Let each side soak for a few seconds, ensuring the bread absorbs the custard without becoming soggy.

Step 6:
Heat a skillet or griddle over medium heat. Add 1 tablespoon of butter and let it melt and foam. Carefully place the soaked sandwiches in the skillet.

Step 7:
Cook for about 3 to 4 minutes per side, pressing slightly with a spatula to help seal everything together. The outside should turn golden brown and crispy, while the cheese inside becomes deliciously gooey.

Step 8:
Once both sides are cooked to perfection, transfer the sandwiches to a cutting board. Let them rest for a minute or two before slicing.

Step 9:
For a brunchy flair, dust lightly with powdered sugar and serve with a small side of jam or even a drizzle of honey. This adds a restaurant-style presentation that looks fancy but takes zero effort.

Step 10:
Serve hot with chips, a salad, or fruit on the side. And don’t forget napkins—this sandwich is gloriously messy in the best way.