Preheat the oven to 375°F (190°C). Line a baking sheet with parchment paper.
Slice the baguette in half lengthwise and place both pieces cut-side up on the baking sheet.
In a medium saucepan, heat the olive oil and butter over medium heat until melted.
Add the minced garlic and sauté for 1 minute until fragrant.
Pour in the heavy cream and bring to a gentle simmer.
Stir in the Parmesan cheese, garlic powder, Italian seasoning, salt, and pepper. Continue stirring until the sauce thickens.
Add the shredded chicken to the Alfredo sauce and mix well, allowing it to heat through for 2–3 minutes.
Spoon the creamy chicken Alfredo mixture evenly over the bread halves.
Sprinkle the mozzarella cheese generously over the top.
Bake for 12–15 minutes or until the cheese is melted and bubbly.
Broil for an additional 1–2 minutes for a golden finish, if desired.
Remove from the oven, garnish with fresh chopped parsley, and slice into portions for serving.