Preheat your oven to 375°F (191°C) and gather your ingredients and tools.

Prepare vegetables by thawing frozen spinach and squeezing out excess water, or par-boil broccoli florets for 2-3 minutes.

In a mixing bowl, combine cooked chicken, crispy bacon, prepared vegetables, and minced garlic. Add ranch dressing and mix well, folding in half of both cheeses.

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

Sprinkle the remaining mozzarella and cheddar over the top of the casserole.

Bake in the preheated oven for 15 minutes, watching for bubbling cheese.

Let cool for about 5 minutes before serving.