01 -
Preheat the oven to 375 degrees F (191 degrees C).
02 -
If using frozen spinach, thaw and squeeze to drain. If using broccoli, place it into a pot of water, bring to a boil, and simmer for 1-2 minutes until bright green.
03 -
In a large bowl, combine the chicken, bacon, drained spinach or broccoli, garlic, ranch dressing, and half of the shredded cheeses. Stir until well mixed. Transfer the mixture into a 9x13 inch (23x33 cm) glass or stoneware casserole dish. Alternatively, mix everything directly in the casserole dish.
04 -
For extra ranch flavor, add 1-3 teaspoons of ranch seasoning mix, in addition to the dressing.
05 -
Top the casserole with the remaining shredded mozzarella and cheddar cheeses.
06 -
Bake for about 15 minutes, until hot and bubbly.