1-First Step: Preheat and Prepare the Bread Start by preheating your oven to 400°F and lining a baking sheet with parchment paper for easy cleanup. Place the Italian bread, sliced lengthwise with the cut side up, on the baking sheet. Spread the softened unsalted butter evenly over both halves and sprinkle with garlic salt to add that classic flavor. Bake the bread for 8 to 10 minutes until it’s lightly golden and crisp, then set it aside to cool slightly. This step creates a sturdy base that holds up to the toppings, and if you’re short on time, you can use a different bread like French loaf for a twist, though Italian works best for that authentic taste.

2-Second Step: Season and Cook the Chicken Next, take the chicken breasts, cut them into ½-inch pieces, and season with ½ teaspoon garlic salt, ½ teaspoon paprika, ½ teaspoon kosher salt, and ¼ teaspoon black pepper for a flavorful boost. Heat 1 tablespoon extra virgin olive oil in a skillet over medium-high heat until it’s shimmering. Cook the chicken for 3 to 4 minutes per side until it’s golden brown and reaches an internal temperature of 165°F, ensuring it’s fully done. Keep the chicken warm while you move on, and for dietary adaptations, you could swap in chicken thighs or even plant-based alternatives to suit preferences.

3-Third Step: Make the Alfredo Sauce In a saucepan over medium heat, melt 2 tablespoons unsalted butter and add the diced yellow onion. Cook for 3 to 4 minutes until the onion is translucent and soft, stirring occasionally to avoid burning. Then, add 2 teaspoons minced garlic and cook for another 30 seconds until fragrant. Pour in 2 cups heavy whipping cream and let it gently simmer, then stir in 2 cups finely grated Parmesan cheese, ½ teaspoon kosher salt, ½ teaspoon black pepper, and ¼ teaspoon crushed red pepper flakes. Continue stirring for 3 to 5 minutes until the cheese melts and the sauce thickens slightly, then remove from heat. For variations, you might swap the heavy cream for half-and-half if you’re watching calories.

4-Fourth Step: Assemble and Bake Pour about ¾ cup of the Alfredo sauce over each toasted bread half, spreading it evenly to the edges for full coverage. Top each half with the cooked chicken pieces, distributing them uniformly. Sprinkle 1 cup shredded mozzarella cheese and 1 cup shredded white cheddar cheese over the chicken. Return the baking sheet to the oven and bake for 8 to 10 minutes until the cheese melts and bubbles. If you want a golden top, broil for 1 to 2 minutes, but watch closely to prevent burning.

5-Final Step: Finish and Serve Remove the bread from the oven and let it rest for 2 to 3 minutes to set. Garnish with chopped fresh parsley for a pop of color and flavor, then slice into portions and serve warm, with any reserved Alfredo sauce on the side for dipping.