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Preheat oven to 375 degrees F. Line a 9×13 pan with foil.
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.
Meanwhile, mix together aioli. In a small bowl, mix together dijon mustard and mayonnaise.
Spread mustard aioli over the bottom layer of buns.
Layer sliced turkey and mushroom mixture over bottom layer. Top with sliced cheese.
Bake sliders for 13-16 minutes, or until cheese is melted and buns are golden brown.