-coarsely chopped Cook the onion & mushrooms together in 4 T of the butter. Mince the onion/mushroom mixture and the chicken together. Add the garlic & the chicken-mushroom mixture and cook for 5 minutes adding salt & pepper to taste. Remove from heat and stirin the yogurt and nutmeg. Preheat the oven to 400 degrees F. Pour the chicken mixture into a baking dish and sprinkle with grated cheese. Bake for 15 minutes.