Spinach Artichoke Grilled Cheese with Mozzarella and Cream Cheese

Ingredients

• 1 cup shredded mozzarella cheese
• 1/2 cup cream cheese, softened
• 1/4 cup grated Parmesan cheese
• 2 tablespoons unsalted butter, softened
• 1 cup fresh spinach, chopped
• 1/2 cup canned or jarred artichoke hearts, drained and chopped
• 1 small garlic clove, minced
• 4 slices sourdough bread
• 1/4 teaspoon salt
• 1/8 teaspoon freshly ground black pepper
• Pinch of red pepper flakes, optional