01 - Preheat oven to 400°F. Line baking sheet with parchment paper.
02 - Heat olive oil in large skillet over medium heat. Add minced garlic and sauté until fragrant, approximately 1 minute.
03 - Pour heavy cream and whole milk into skillet. Bring to gentle simmer, then incorporate Parmesan cheese, salt, black pepper, red pepper flakes, and Italian seasoning. Whisk continuously until cheese melts completely and sauce achieves smooth consistency.
04 - Add shredded chicken breast to Alfredo sauce. Stir thoroughly to coat all pieces evenly. Remove from heat.
05 - Slice baguette lengthwise to create two halves. In small bowl, combine softened butter, minced garlic, and chopped parsley. Mix until homogeneous. Spread garlic butter mixture evenly across cut surfaces of both bread halves.
06 - Distribute chicken Alfredo mixture over buttered bread halves, ensuring even coverage. Sprinkle mozzarella and provolone cheeses generously over top.
07 - Transfer prepared bread to lined baking sheet. Bake for 12-15 minutes until cheeses achieve complete melt and develop golden-brown bubbles along edges.
08 - Remove from oven and allow brief cooling period, approximately 3-5 minutes. Cut crosswise into individual serving portions. Serve while warm.