Roasted Frozen Cauliflower

4.50 from 163 votes

Frozen vegetables are one of the easiest dinner time sides. This roasted frozen cauliflower is easy to make and tastes amazing! All you need is a bag of frozen cauliflower, olive oil, and a few spices to make this simple dish your family will love. 

roasted frozen cauliflower on a baking sheet with a red spatula
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This easy roasted frozen cauliflower is the answer to trying a new vegetable side dish this week! Frozen roasted vegetables are my go to side these days. 

I already have recipes for roasted frozen carrots , roasted frozen brussel sprouts, roasted frozen corn, how to cook frozen green beans, and frozen broccoli, so of course cauliflower needed to be next on my list to make! 

Especially with times like we find ourselves in currently, frozen vegetables are an absolute must have. My freezer is stocked full of bags of all kinds and it has made dinner time quicker. The convenience factor cannot be beat. When you need a fast and healthy side dish, frozen vegetables are the answer!

roasted cauliflower on a brown baking sheet

How to make roasted frozen cauliflower

You will need one bag of frozen cauliflower. If you are feeding more than 2-3, just double this recipe! One thing I notice is that we always regret not making more. This roasted cauliflower is so delicious I could have eaten the whole batch myself!

Preheat your oven to 450 degrees. Place the cauliflower on a nonstick sheet pan. 

frozen cauliflower on a baking sheet with spices sprinkled on it before cooking

Do not allow the cauliflower to thaw before cooking. Roasting from frozen allows us to get the perfect texture and those delicious crispy edges. It’s very important to place the cauliflower straight from the freezer to the tray, with the oven already preheated.

Use olive oil cooking spray to generously coat the top of the cauliflower. I always suggest cooking spray when preparing frozen vegetables, as it is much easier to make sure everything is well coated. 

roasted cauliflower on a baking sheet up close

Once the cauliflower is sprayed, sprinkle on even amounts of salt, pepper, garlic powder, and onion powder. No need to stir, just sprinkle so that it is all evenly covered. Place the cauliflower in the preheated oven and cook for 15 minutes without touching it. 

This will help the cauliflower edges crisp up! After 15 minutes, remove the pan from the oven and stir/flip the cauliflower. Spray the cauliflower again with a light layer of olive oil cooking spray, then sprinkle powdered parmesan cheese over the tops of the florets. 

Roast for an additional 5-10 minutes, until the cauliflower is browned with crispy parmesan edges!

roasted frozen cauliflower on a brown baking sheet

The recipe is simple, but it’s all in the method! This cauliflower was the favorite food on my plate.  Roasting cauliflower without any fuss and no chopping required is perfect for busy nights (or for when you are cooking dinner for what feels like the 100th night in a row). 

Try making this for dinner and let me know what you think! Looking for more recipes? Be sure to also try this Air Fryer Frozen Cauliflower.

a red spatula picking up a scoop of roasted cauliflower
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a red spatula with roasted frozen cauliflower on it
4.50 from 163 votes

Roasted Frozen Cauliflower Recipe

By: Joy Shull
Easy roasted frozen cauliflower recipe with crispy parmesan edges. The best roasted cauliflower recipe!
Prep: 5 minutes
Cook: 25 minutes
Total: 30 minutes
Servings: 2


  • 12 oz bag of frozen cauliflower
  • olive oil spray
  • salt
  • pepper
  • garlic powder
  • onion powder
  • powdered parmesan cheese


  • Preheat your oven to 450 degrees
  • Place the frozen cauliflower florets on a nonstick baking sheet and spray generously with olive oil spray to coat
  • Sprinkle on even amounts of salt, pepper, garlic powder, and onion powder until evenly coated
  • Roast at 450 degrees for 15 minutes without flipping
  • Remove from the oven after 15 minutes, and stir/flip the cauliflower
  • Spray again with olive oil spray, then sprinkle on powdered parmesan cheese over the tops of the cauliflower florets
  • Roast an additional 5 – 10 minutes, until florets are browned with crispy edges
  • Serve and enjoy!



Calories: 43kcal, Carbohydrates: 8g, Protein: 3g, Fat: 0.5g, Saturated Fat: 0.2g, Polyunsaturated Fat: 0.1g, Monounsaturated Fat: 0.1g, Sodium: 51mg, Potassium: 509mg, Fiber: 3g, Sugar: 3g, Vitamin C: 82mg, Calcium: 37mg, Iron: 1mg
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  1. I made the whole 500 g bag of frozen cauliflower for two of us, as the recipe suggests. We ate about 2/3. But the rest got eaten cold as a bedtime snack.
    I added turmeric and paprika to the powdered spices for more colour, and roasted them an additional 15 min, not 5-10 after I flipped them.
    A brilliant low cal, low carb, fibre rich addition to a meal of baked chicken breast with a bit of lettuce salad filling up the plate.

  2. This recipe was so delicious! I did keep mine in the oven an extra five minutes and added provolone cheese! Thank you for the recipe!

  3. I did a bag of cauliflower for my husband and myself. We ate the whole thing. So good. I’m going to stock up on frozen cauliflower.

  4. I always substitute wok oil for olive oil. It has seasonings within, perfect for high heat and still works with any other added flavors. Thanks for all this frozen veggie help.