Start by cutting the chicken breast into ½-inch cubes. Then, toss it in a bowl with garlic powder, salt, and pepper. Coat all sides evenly with the seasoning.

Heat the butter in a skillet over medium-high heat and pan-fry the chicken for approximately 3 minutes on each side. Once cooked through, remove from heat and set aside.

While the chicken cooks, begin trimming the broccoli and cut it into florets (just the top part, with minimal stalk). Steam broccoli until tender for about 6 minutes. Remove from heat and set aside.

While the broccoli steams, begin preparing the Alfredo sauce. If you are using store-bought sauce, jump down to the next step.Simmer the garlic in butter in a small saucepan for 2 minutes until fragrant. Mix in cream. Slowly add the parmesan and stir continuously until it's a thick, uniform sauce. Finally, season with nutmeg, remove from heat and set aside.

Put the chicken bake together by spreading ½ cup of Alfredo sauce in the bottom of a 9x13-inch baking dish. Layer half the cooked chicken with half of the steamed broccoli arranged over it. Then, spoon 1 cup of Alfredo sauce over the broccoli and sprinkle 1 cup of mozzarella cheese on top of the sauce.

Repeat the process for a second layer with all the remaining chicken, broccoli, sauce, and shredded cheese. Garnish with parsley and place under the broiler in the oven for 5 minutes on high until the cheese melts, bubbles, and begins turning golden brown. Remove from the oven and let sit for a few minutes before serving warm.