Pizza Spinach Squares

Ingredients

• 1/4 pound pepperoni slices
• 1 cup flour, unbleached all-purpose plus 2 tablespoons
• 1 teaspoon baking powder
• 3/4 teaspoon salt
• 1/2 teaspoon black pepper
• 1/4 teaspoon cayenne pepper
• 1 cup chicken broth, low salt
• 3 large eggs
• 1 1/4 pounds spinach frozen, chopped, thawed and squeezed dry
• 12 ounces mozzarella cheese shredded (3 cups)
• 1 each onions finely chopped
• 2 cloves garlic minced
• 1 ounce parmesan, parmigiano-reggiano cheese, grated (1/2 cup)