spinach brownies

adapted from allrecipes.com

1 (10 ounce) package spinach, rinsed, squeezed dry and chopped
1 cup all-purpose flour
1 teaspoon salt
1 teaspoon baking powder
2 eggs
1 cup milk
3 Tablespoons butter, melted
1 onion, chopped and sautéed
1 (8 ounce) package shredded mozzarella cheese (I use swiss/cheddar, or feta)
1 clove garlic, minced (saute with the onion)
pinch of nutmeg
pinch of cayenne pepper
1/8 tsp pepper

DIRECTIONS:
1. Preheat oven to 375 degrees F (190 degrees C). Lightly grease a 9x13 inch baking dish.
2. In a large bowl, mix flour, salt, cayenne, pepper, nutmeg and baking powder. Stir in eggs, milk and butter. Mix in spinach, onion/garlic and cheese.
3. Transfer the mixture to the prepared baking dish. Bake in the preheated oven 30 to 35 minutes, or until a toothpick inserted in the center comes out clean. Cool before serving.