Preheat oven to 350F and preheat a cast iron skillet on the stove to medium-high.
Remove rolls from package and slice them in half horizontally. Slather the inner part of the bottom portion with mayonnaise and the inner part of the top portion with raspberry jam.
Layer the bottom portion with turkey, ham and brie cheese.
Melt ¼ cup of butter and whisk together with dijon mustard and two eggs. Pour onto a plate large enough to fit the rolls in.
Coat all sides of the preheated skillet with 1 tbsp. Butter. Place bottom portion of the rolls into the egg mixture and then place them immediately in the cast iron skillet. Dunk the top portion of the rolls (raspberry jam side-up) into the egg mixture and then flip and place raspberry-side down over the brie cheese layer. Heat the sliders in the skillet for 1 minute.
Lightly tent the sliders with foil and transfer them from the stove to the oven. NOTE: Spray the inside of the aluminum foil with cooking spray, or it will stick to the top of the rolls. Bake for 20 minutes, then remove foil and continue to bake for another 10 minutes.
Remove from the oven and transfer sliders from the cast iron skillet to a cooling rack. Cool for 10 minutes before slicing. Dust with powdered sugar just before serving.
Recipe by Slice of Jess at https://sliceofjess.com/brioche-monte-cristo-sliders-recipe/