Potato Latke Galette, Stuffed

Ingredients

• 1-1/2 lbs. large red-skinned potatoes (do not peel)
• 2 zucchini
• 1 medium onion
• 1/4 to 1/2 cup Italian parsley, finely chopped
• 4 large eggs, lightly beaten
• 2 tablespoons flour
• 1 teaspoon salt
• 1/4 teaspoon pepper
• Grated nutmeg to taste
• 1 teaspoon baking powder
• Vegetable oil for frying
• 1 lb. fancy mushrooms, cleaned and sliced, 3 or more varieties, (e.g. Shiitake, Portobello, oyster, Chanterelle, cremini, porcini, etc.) For Shiitake and oyster, remove stems and save for stock