Heat skillet to medium high heat. Brown turkey meat and drain. Sprinkle with salt and pepper and add balsamic vinaigrette. Stir and heat 2 minutes.
Meanwhile use a wet paper towel to clean off mushroom caps. Remove stem and ribs of mushrooms.
Heat a grill or griddle pan to medium high heat and add mushroom caps, top down. Heat for 5 minutes and then flip over. Scoop turkey meat into mushroom cap and heat another 5 minutes.
Remove from heat and add cheese over top. Let cool and serve.