Stir in the marsala and balsamic and season generously with salt and pepper.
Transfer the mixture to a food processor or blender and pulse until you get the consistency you like (for a chunky or smooth dip).
Allow to cool fully (refrigerate to speed things up). Put in a bowl with the yogurt and mix well to combine. Serve immediately or cover, refrigerate, and serve within 24 hours.
Notes
Gluten free, Kosher dairy, Vegetarian
Recipe by Katherine Martinelli at http://www.katherinemartinelli.com/blog/2013/black-garlic-mushroom-dip/