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.