Season both sides of the chicken breast with paprika, salt, and onion powder.
Heat a pan with a drizzle of oil and cook the chicken for 5–7 minutes per side, or until fully cooked through. Set aside and slice.
Spread garlic confit, butter, or garlic butter onto the French bread. Toast in the oven for 5 minutes at 350F.
Meanwhile, prepare the Alfredo sauce. In a pan, melt butter, then stir in the flour to form a roux. Whisk continuously. Slowly add the heavy cream, stirring until smooth and thickened. Season with onion powder, Italian seasoning, and black pepper. Stir in Parmesan cheese until fully melted and combined. Remove from heat.
Spread the Alfredo sauce over the toasted bread. Add sliced chicken on top, then sprinkle generously with mozzarella cheese.
Return to the oven and bake until the cheese is melted and bubbly. Broil at the end for a golden, slightly crispy top.
Slice and enjoy.