Spinach Brownies

1 (10 ounce) package spinach, rinsed and chopped
1 cup all-purpose flour
1 teaspoon salt
1 teaspoon baking powder
2 eggs
1 cup milk
1/2 cup butter, melted
1 onion, chopped
1 (8 ounce) package shredded mozzarella cheese

Preheat oven to 375 degrees F (190 degrees C). Lightly grease a 9x13 inch baking dish.
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.
In a large bowl, mix flour, salt and baking powder. Stir in eggs, milk and butter. Mix in spinach, onion and mozzarella cheese.
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. Serve warm!

These are really good! When I made these I used fresh spinach and pepper jack and Cheddar cheese! I think that the pepper jack made it! Me and my mom tried it the next day without the pepper jack and it just wasn't the same!