My “Marry Me” Party Dip Always Disappears in Minutes

Name: My “Marry Me” Party Dip Always Disappears in Minutes
Ingredients: Nonstick cooking spray; 1 (8-ounce) block cream cheese , softened; 1/2 cup julienned sun-dried tomatoes packed in oil , drained; 2 teaspoons sun-dried tomato oil from the jar; 1 cup sour cream; 3 ounces frozen spinach (half of a 6-ounce package); 6 tablespoons grated parmesan , divided; 1 1/2 cups (6 ounces) shredded mozzarella cheese , divided; 1/2 teaspoon Italian seasoning; 1/2 teaspoon garlic powder; 1/4 teaspoon salt; 1/8 teaspoon ground black pepper; 1 leaf fresh basil , optional