Irresistible Ricotta and Spinach Calzones

Ingredients

• 10 ounces frozen chopped spinach, thawed and squeezed dry
• 8 ounces ricotta cheese
• 4 ounces mozzarella cheese, shredded
• 1 ounce Parmesan cheese, grated
• 1 tablespoon olive oil
• 1 large egg, lightly beaten with 2 tablespoons water
• 1 large egg yolk
• 1 teaspoon garlic powder
• 1 1/2 teaspoons minced fresh oregano
• 1/8 teaspoon red pepper flakes
• 1 teaspoon salt
• 1 pound pizza dough