Boil cauliflower for 8-10 minutes or until fork tender; drain.
In a large bowl, combine mayonnaise, sour cream, half of the bacon, 3 tablespoons green onions, 1/2 cup Colby cheese, 1/2 cup cheddar cheese, All Purpose Seasoning blend and cauliflower.
Pour into 13x9 baking dish and top with remaining bacon, green onions and cheeses.
Bake for 15-20 minutes or until cheese melts.
Notes
More Veggies: Boost the nutritional value of your casserole by adding more vegetables. Incorporated roasted vegetables like bell peppers or zucchini. Make this as a potato casserole if you like.
Roasted Cauliflower: To add an extra layer of flavor, consider roasting the cauliflower before adding it to the casserole.
Meat: If you're a meat lover, experiment with adding diced cooked chicken or turkey to make the casserole heartier.
Fresh Herbs: Garnish your casserole with fresh herbs like parsley or chives for a burst of color and freshness.
Cheese: Use a low fat shredded cheddar cheese or other shredded cheese for a lower calorie side.