01 -
Turn the oven on and set it to 375°F (191°C).
02 -
For frozen spinach, thaw it and squeeze out any water. If you're using broccoli, let it boil for a minute or two in water until it turns bright green.
03 -
In a large bowl, toss together the chicken, bits of bacon, broccoli or spinach (after draining if necessary), garlic, ranch dressing, and half of both shredded cheeses. Give it a good stir. Once mixed, pour it into a 9x13 inch (23x33 cm) casserole dish. Or, you could mix directly in the dish to save time.
04 -
If you like bold ranch flavors, sprinkle in 1-3 teaspoons of dry ranch seasoning mix alongside the dressing.
05 -
Evenly sprinkle the rest of the mozzarella and cheddar cheese over the top of the dish.
06 -
Let it cook for around 15 minutes, just until the edges start bubbling and it's nice and hot.