1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish to prevent sticking.
2. In a large mixing bowl, combine the shredded chicken, Alfredo sauce, mozzarella cheese, Parmesan cheese, frozen peas, garlic powder, and black pepper. Stir until well mixed.
3. Pour the mixture into the prepared baking dish, spreading it evenly with a spatula.
4. Top the mixture with an even layer of frozen tater tots, arranging them neatly for even baking.
5. Bake in the preheated oven for 35-40 minutes, or until the tater tots are golden brown and the casserole is bubbling.
6. Remove from the oven and let it sit for a few minutes. Sprinkle with chopped parsley for a fresh touch before serving.

When I make this dish, I often remember the bustling kitchen of my childhood, where timing was everything and patience was a virtue. Letting the casserole rest for a few minutes allows the flavors to meld beautifully, just as my grandmother would let her dishes sit before serving.