Loaded Cauliflower Casserole •2 lbs cauliflower florets •8 oz shredded sharp cheddar cheese, divided •8 oz shredded Monterey Jack cheese, divided •8 oz block cream cheese, softened •4 tablespoons heavy cream •2 bunches green onions, sliced (1½ cups) •6 sliced bacon, cooked and crumbled •1 clove garlic, grated •Salt & pepper to taste