Melt the butter and add the garlic clove, and sauté until the garlic is tender and fragrant, about 30 seconds. Add the chopped shrimp and cook until it is just pink, be careful not to overcook.
Slice the french bread in half, and pull out some of the inside bread. Place the bread on a parchment or silicon mat lined baking sheet. Divide the alfredo sauce between the two pieces.
Remove the shrimp from it's cooking liquid put on top of the alfredo sauce. Top with mozzarella and then parmesan.
Bake for 18 to 20 minutes or until the edges of the bread begin to toast.
Remove from oven, top with fresh parsley and serve immediately.
Notes
Frozen shrimp is perfect in this recipe and takes just a small bit of prep. Place one pound of frozen, peeled, raw shrimp in a colander under cold running water. Rotate every few minutes, and in about 15 minutes, you will have shrimp ready to cook. This step can be done the day before to save time.