Balsamic Mushrooms

1 tbsp.  Olive Oil
1 Leek, sliced
8  oz. whole Cremini Mushrooms
1/2 tsp. Red Pepper Flakes
2 cloves Garlic
3 tbsp. Balsamic Vinegar
1/4 tsp. Pepper
1/4 tsp. Salt

Heat olive oil in a skillet.  Add in leek and saute for 3 minutes.  Add in garlic and red pepper flakes, cook another minute.  Add mushrooms and balsamic vinegar.  Cook another 7-10 minutes, stirring occasionally, until tender.  Season with salt and pepper.