Start by setting your oven to 375°F (190°C). Lightly grease your baking dish with olive oil so the chicken doesn’t stick during baking.
Pat the chicken breasts dry with a paper towel. Season both sides with salt, pepper, and garlic powder to lock in flavor.
If you’re making it from scratch, heat butter, cream, and garlic in a saucepan over medium-low heat. Stir until it thickens, then add Parmesan for a smooth, creamy sauce.
Place the chicken in the baking dish and pour Alfredo sauce over each piece. Let it sit for 15–20 minutes so the flavors soak in. Put the dish in the oven and bake uncovered for 25–30 minutes. Use a meat thermometer to check the internal temperature—it should be 165°F.
Sprinkle mozzarella and extra Parmesan on top. Return to the oven for about 10 minutes until the cheese melts and turns golden. Take it out, garnish with chopped parsley or basil, and serve while it’s hot and bubbly.