Prepare the Bread and Cheese: Slice each bread loaf in half lengthwise with a sharp serrated knife to create two long, flat surfaces.
Scoop interior: Using your fingers or a small spoon, gently remove some of the soft interior crumb from each half, creating a slight hollow without breaking through the crust.
Add cheese: Distribute the shredded mozzarella evenly across all four bread halves, pressing gently so it adheres.
First bake: Place the bread halves on a baking sheet and bake at 400 degrees Fahrenheit (200 degrees Celsius) for 5 to 7 minutes until the cheese is bubbly and beginning to brown.
Cook the Shrimp: While the bread bakes, heat 2 tablespoons of butter in a large skillet over medium-high heat until it's foaming and fragrant, about 1 minute.
Add aromatics: Add the minced garlic cloves and cook for 30 seconds until fragrant.
Cook shrimp: Add the shrimp to the skillet in a single layer and cook for 2 to 3 minutes per side until they turn pink and opaque throughout.
Season and cool: Season the cooked shrimp with salt and paprika to taste, then transfer to a clean plate and let cool slightly.
Assemble the Bread: Distribute the cooked garlic shrimp evenly over the melted mozzarella on each bread half.
Make garlic butter: In a small bowl, whisk together the melted butter, grated garlic, salt, paprika, and finely chopped cilantro or parsley until well combined.
Brush topping: Using a pastry brush or the back of a spoon, brush the garlic butter mixture liberally over the shrimp and bread surface.
Final bake: Return the bread to the oven and bake at 400 degrees Fahrenheit (200 degrees Celsius) for 3 to 5 minutes until the top is golden and the garlic butter is absorbed.
