Step 1

Preheat oven to 375 degrees F. Line a 9×13 pan with foil.

Step 2

Heat 2 tablespoons of butter in a medium skillet over medium heat. Once it foams, add mushrooms and onions to pan. Season with a pinch of salt. Cook, stirring regularly, for about 6-8 minutes, until soft and lightly caramelized.

Step 3

Meanwhile, mix together aioli. In a small bowl, mix together dijon mustard and mayonnaise.

Step 4

Spread mustard aioli over the bottom layer of buns.

Step 5

Layer sliced turkey and mushroom mixture over bottom layer. Top with sliced cheese.

Step 6

Bake sliders for 13-16 minutes, or until cheese is melted and buns are golden brown.