Syn Free Roast Potatoes | Slimming World

Sundays are the best day of the week, and in this house, the classic roast dinner usually makes an appearance, with a generous helping of Syn Free Roast Potatoes!

Syn Free Roast Potatoes | Slimming World

For the full list of ingredients and comprehensive instructions, please see the recipe card at the end of this post. Before you scroll, there’s important stuff in the blurb 👍

Sometimes speed food on Slimming World can get to be a bit of a chore but with a roast you can have loads of speed food, and not really nice you’re eating it! Roasted meat & syn free vegetables wouldn’t be complete without roast potatoes, right?

Syn Free Roast Potatoes | Slimming World

Just because we’re talking about Sundays, doesn’t mean you can only have these Syn Free Roast Potatoes on a Sunday. You can have them every day of the week if you like, especially as they’re syn free. They go well with our other Roast Dinner recipes:

Preheat oven, peel and cut potatoes

Let the oven preheat whilst you’re prepping your potatoes. Make sure to peel them well, and take out any eyes. If you prefer to leave the skin on – you can if you like.

Dicing them – you’ll probably want to keep them a couple of inches in size & try keep them as consistent as possible so they cook at the same rate.

Parboil your Potatoes

Rinse your spuds with some cold water, then place in a pan filled with water and season with plenty of salt. You want to bring them to the boil, and let them cook until they start to soften but they are still firm.

Drain & Dry

Drain them in a colander & leave them there for 5 minutes. This will let them dry out a bit. After the 5 minutes, put them in a bowl, season with plenty of salt then spray with plenty of Frylight. Toss them, then spray them again as you’re tossing them. They need to be very well coated.

Cook & Eat

Spray a baking tray with Frylight, tip out the potatoes and bake for 40 minutes at 200°C turning half way. If they look like they’re drying out half way, spray them with a bit more Frylight.

Whenever we need to replace oil in cooking we use Frylight. Perfect for everyday frying and cooking, it delivers exactly one calorie per spray, which makes it Syn free! The Rapeseed or Olive Oil flavours are ideal for this Syn Free Roast Potatoes recipe.

Frylight Find Out More

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Syn Free Roast Potatoes

Votes: 18
Rating: 4.11
Rate this recipe!


Prep Time

Cooking Time

people 10 minutes 50 minutes



Slimming World 

275kcal 5

Smart Points (Flex/Freestyle)



Per people Per people Per people
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  1. Preheat oven to 200°C. Peel potatoes and remove any eyes
  2. Dice the potatoes into pieces around 2in/5cm in length & rinse with cold water. Place in a pan filled with cold water & add plenty of salt
  3. Bring the pan up to the boil, and let them cook until they start to soften but they are still firm
  4. Drain them in a colander & leave them there for 5 minutes. After the 5 minutes, put them in a bowl, season with plenty of salt & spray with plenty of Frylight. Toss them, then spray them again as you're tossing them. They need to be very well coated!
  5. Spray a baking tray with Frylight and tip out the potatoes. Bake for 40 minutes making sure to turn half way. If they look like they're drying out half way, spray them again with a bit more Frylight.

If you make this recipe, snap a pic and hashtag it #pinchofnom — We love to see your creations on InstagramFacebook, & Twitter!


We use a fan assisted oven for all of our recipes. Need help converting the temperature for your oven? 

Click here for our oven temperature conversion guide.


Syn values given are correct at time of writing but may not always be accurate.

This website is UNOFFICIAL and in NO WAY part of or representative of Slimming World. 

We aren’t trained by Slimming World nor authorised to give Slimming World advice. Any advice given here should not replace the advice of your Slimming World consultant.

Ideally, you should check with Slimming world for the most up to date Syn values using official resources such as; the Syns calculator, Syns Online on LifelineOnline or by calling the Syns Hotline on (0906) 851 8518.

Although attempts to provide accurate nutritional information, these figures should be considered estimates. Varying factors such as product types or brands purchased, natural fluctuations in fresh produce, and the way ingredients are processed change the effective nutritional information in any given recipe. Under no circumstances will be responsible for any loss or damage resulting for your reliance on nutritional information.

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As our recipes change often in accordance with syn value changes, we want to ensure that they're as accurate as possible at all times. 

If you use or re-create our recipes we kindly ask:

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  • You don't reproduce the recipe in full

    1. Hi Alison,

      Potatoes are roughly 70 kcal/100g so add that to how ever many sprays of the 1cal spray.

      Many thanks!

    1. Hi Margaret
      If you use the rough guide of 20 cals per syn then you can use upto 20 sprays (at 1 cal a spray) before you would have to syn it. As this is recipe is for 2 portions then you could use upto 40 sprays before needing to syn it

  1. I put mine in the microwave for 5 mins without water instead of par boiling after they are cooled i put them in a food bag sprayed with fry light and crumble a beef oxo into it toss it around to coat all of the potato and cook for around 25 mins to half hour in my actifry they are very tasty

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A blog started by 2 chefs on their Slimming World journey, evolving into an epic adventure shared by many!