Spread the pizza sauce: Take two slices of sourdough bread and spread a generous layer of pizza sauce on one side of each slice. This is where the pizza magic begins.
Add the cheeses: On top of the pizza sauce, evenly distribute 1 cup of shredded mozzarella and 1/4 cup of grated Parmesan on each slice. These cheeses will melt together to create a rich, gooey center.
Close the sandwiches: Place the remaining slices of sourdough bread on top of the cheese-covered slices to form two sandwiches.
Step 3: Prepare for Cooking
Butter the bread: Generously spread the garlic herb butter on the outside of each sandwich, making sure to coat both the top and bottom slices. This will ensure that your sandwich gets golden brown and crispy when it cooks.