Sun-Dried Tomato Mixture:

• 1/2 cup drained julienne-cut sun-dried tomatoes in oil, chopped
• 1 tablespoon oil from sun-dried tomatoes jar
• 1 tablespoon minced garlic
• 1 tablespoon tomato paste

Cream Cheese Mixture:

• 1 (8 ounce) package cream cheese, softened, cut into 1-inch cubes
• 1 cup sour cream
• 1 (6 ounce) package frozen cut leaf spinach, thawed and drained, then patted dry
• 1/2 cup Parmesan cheese, grated
• 1 teaspoon Italian seasoning
• 1/4 teaspoon freshly ground black pepper
• 1/4 teaspoon kosher salt
• 1 1/4 cups shredded low-moisture part-skim mozzarella cheese, divided

For Serving:

• Chopped fresh basil
• Crostini toast