Pepperoni Pizza Spinach Squares | America's Test Kitchen

Ingredients

• 4 ounces (113 grams) sliced pepperoni
• 1 cup (5 ounces/142 grams) plus 2 tablespoons all-purpose flour
• 1 teaspoon baking powder
• 3/4 teaspoon salt
• 1/2 teaspoon pepper
• 1/4 teaspoon cayenne
• 1 cup low-sodium chicken broth
• 3 large eggs
• 1 1/4 pounds frozen chopped spinach , thawed and squeezed dry
• 12 ounces (340 grams) mozzarella cheese , shredded (3 cups)
• 1 onion , chopped fine
• 2 garlic cloves , minced
• 1 ounce (28 grams) Parmesan cheese , grated (1/2 cup)