Directions
1. Preheat oven to 375 degrees F (190 degrees C). Lightly grease a 9x13 inch baking dish.
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2. Place spinach in a medium saucepan with enough water to cover. Bring to a boil. Lower heat to simmer and cook until spinach is limp, about 3 minutes. Remove from heat and set aside.
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3. In a large bowl, mix flour, salt, and baking powder. Stir in eggs, milk and butter. Mix in spinach, onion and mozzarella.
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4. Transfer the mixture to the prepared baking dish. Bake in the preheated oven 30-35 minutes, or until a toothpick inserted in the center comes out clean. Cool before serving.