Spinach and Artichoke Sheet Pan Pizza

Ingredients (8)

• 3 tablespoons olive oil, divided
• 1 pound pizza dough (store-bought or homemade)
• 1 teaspoon Italian seasoning
• 4 cloves garlic, chopped
• 1 (6-ounce) bag baby spinach
• 1 (12- to 14-ounce) jar marinated artichoke hearts, drained thoroughly (and sliced if needed; see Recipe Note)
• 1 1/2 cups (6 ounces) shredded mozzarella cheese
• Crushed red pepper flakes (optional)