¼ Cup Parmigiano-Reggiano, Romano, or additional Smoked Gouda Cheese - grated
3 Tbs Fresh Parsley - chopped fine
Preparation:
Preheat oven to 350ºF - Adjust oven rack to top third of oven
Melt butter in a 10-12 inch, oven safe, nonstick skillet over medium-high heat
Add onion and sauté for 3 minutes - Add mushrooms and continue to sauté until tender (apx 4-5 minutes) - Add garlic along with salt and pepper to taste (apx ¼ tsp each) and continue to sauté until most of the liquid has evaporated
Add spinach and allow to cook (stirring frequently) until spinach is just wilted (apx 1-2 minutes) - Remove from heat and adjust seasoning - Set aside until needed
In a medium bowl, whisk together the eggs, milk, ¼ tsp kosher salt, and ¼ tsp pepper until well integrated and 'frothy' - Add the grated smoked gouda and thoroughly combine
Pour the egg mixture over the spinach/mushroom mixture and thoroughly combine
Transfer skillet to oven and allow to bake 15 minutes
Sprinkle any 'garnish cheese' over the top of the frittata and continue to bake for an additional 15 minutes or until the center has set and top is slightly browned
Remove from oven and allow to cool for 5-10 minutes
Use a rubber/silicone spatula to loosen frittata from skillet and gently transfer to a cutting board by placing cutting board over skillet and inverting leaving frittata on cutting board and removing the skillet
Serve hot, warm, or room temperature garnished with optional parsley and sliced into 6-8 wedges
*Can use button, cremini,shiitake, chanterelle, portobello, porcini, or a mix