Created by tater on September 6, 2012
Step 1: Preheat oven to 350 degrees F. Lightly grease a 9x13-inch glass baking dish.
Step 2: In a large skillet, melt 3 tablespoons butter over medium-high heat. .Add the onions, 1/4 teaspoon salt, and 1/4 teaspoon freshly ground black pepper, and cook, stirring, until soft, about 3 minutes. Add the garlic and cook, stirring, for 1 minute. Add the mushrooms and cook until they release their liquid, about 5 minutes. Remove from the heat.
Step 3: In a large bowl, combine the spinach, artichoke hearts, mushroom mixture, ricotta, jack, and feta, and toss to combine.
Step 4: In a separate bowl, beat the eggs, nutmeg, remaining 1/4 teaspoon salt and 1/4 teaspoon pepper. Add to the spinach mixture. Add the bread crumbs and mix well. Transfer to the prepared dish and top with a layer of Parmesan.
Step 5: Bake until the casserole is firm and the top is golden, about 45 to 50 minutes.