Halloween Pizza Skulls With Melty Pepperoni Filling

Ingredients

• Olive oil spray or 1 tablespoon olive oil, for greasing
• 13.8-16 oz (390-450 g) refrigerated pizza dough or homemade pizza dough
• 1 tablespoon all-purpose flour, for rolling
• 1 1/2 cups (170 g) shredded low-moisture mozzarella cheese
• 6 tablespoons pizza sauce, plus more for dipping
• 1/2 cup (55 g) chopped pepperoni
• 1/3 cup (45 g) cooked crumbled Italian sausage
• 2 tablespoons grated Parmesan cheese
• 1/2 teaspoon Italian seasoning
• 1 large egg
• 1 teaspoon water