Solid question. I was wondering the same thing, if we could frozen cauliflower to save time. I tried it, and you definitely can in a pinch. It's still yummy. But after trying, I really think it's worth the extra 5-10 minutes of cutting the fresh cauliflower. It just roasts SO much better. Another time saving option would be to buy the pre-cut cauliflower florets. You could also get a pre-cut bag of cauliflower and broccoli and use that - that works awesome!u003cbr/u003eu003cbr/u003eBut if you do decide to still use the frozen cauliflower, make sure to get rid of any ice. We want the oil to coat the cauliflower so it's roasts, and a lot of time it's hard to do that when using frozen cauliflower. Baking times may need to be adjusted as well since frozen cauliflower is already cooked.