Preheat your oven to 375°F (191°C).

If using frozen broccoli, thaw and drain completely. For fresh broccoli, blanch in boiling water for 1-2 minutes.

In a large mixing bowl, combine cooked chicken, crispy bacon, blanched broccoli, and minced garlic. Add ranch dressing, mozzarella, and cheddar cheese, mixing thoroughly.

For quicker cleanup, mix all ingredients directly in a greased casserole dish.

Transfer the mixture into a greased 9x13 inch casserole dish, spreading evenly.

Sprinkle remaining mozzarella and cheddar cheese over the casserole.

Bake for about 15 minutes or until bubbly and lightly browned on top.

Cool slightly before serving.