Preheat oven to 350 degrees.
Steam broccoli & cauliflower on stovetop until tender. Strain & run under cold water to stop the cooking process.
In a large bowl, combine chicken, half the bacon, garlic, broccoli, cauliflower & half the shredded cheese.
Add the ranch dressing & mix well.
Transfer to a large baking dish & top with remaining cheese & bacon.
Bake for 15 minutes.