Preheat oven to 400 degrees F. Line a baking sheet with parchment paper; set aside.

Melt butter in a skillet over medium-high heat. Add garlic and sauté for 1 minute, stirring frequently. Add flour and cook for an additional minute. Whisk in milk until well combined. Bring to a low boil then reduce heat to medium-low, and cook for an additional 2 minutes, or until thickened. Add parmesan cheese, salt and nutmeg and stir until cheese is melted and sauce is smooth; remove from heat.

Cut french bread in half lengthwise and place cut-side open on prepared baking sheet. Spread half the alfredo sauce on top of each half.

Top each half of the bread with half the shredded cheeses, chicken and ham. Bake for 10-15 minutes, or until cheese is melted. Remove from oven and garnish with parsley before serving.