Preheat oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.

In a large bowl, mix Alfredo sauce, sour cream, garlic powder, onion powder, Italian seasoning, salt, and pepper until smooth.

Stir in the cooked chicken until fully coated in the creamy Alfredo mixture.

Spread the mixture evenly into the prepared baking dish. Add turkey bacon bits if using.

Arrange frozen tater tots in a single, even layer on top.

Sprinkle mozzarella and Parmesan evenly over the tater tots.

Bake for 40–45 minutes until cheese is bubbling and tater tots are golden brown and crispy.

Let rest 5–10 minutes before serving. Garnish with fresh parsley.

This Creamy Chicken Alfredo Tater Tot Casserole is best served warm while the cheese is perfectly melted and the topping stays crisp.