Baked Onions with Thyme Butter (Keto)

This is a delicious and interesting side dish using baked onions drizzled with a flavoured herb butter. The onions bake away in a tightly-packed foil parcel down to a sweet, roasted flavour and the thyme butter lifts it to a sensational level!

– – – – – – PER SERVING – – – – – –
Carbs 5.9g | Fat 14g | Protein 0.9g
– – – – – – – – – – – – – – – – – – – – –

DID YOU KNOW that I am also the author of two cookbooks! My first book KETO KITCHEN (published by Kyle Books London, 2020) is available worldwide and has consistently remained one of the best-selling low carb cookbooks in the UK. My second book LAZY KETO KITCHEN (2021) is coming out this summer, and is now available to pre-order.

“I want you to achieve the best outcome with all the recipes on Fats of Life. If you haven’t already done so, please read the RECIPE SUCCESS page which is packed with handy tips and advice. Happy Cooking, everyone!”Monya

Pin me
Print me

Baked Onions with Thyme Butter (Keto)

A delicious and interesting side dish using baked onions and flavoured butter... The onions bake down to a sweet, roasted flavour and the thyme butter lifts it to a sensational level!
Course Side Dish
Cuisine General
Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
Servings 4 as a side dish


For the thyme butter

  • 50 g unsalted butter, softened (room temperature)
  • 2 tsp fresh thyme, picked leaves
  • 1 clove garlic, peeled and crushed
  • sea salt flakes

For the onions

  • 2 large onions, peeled and halved
  • 4 tsp olive oil
  • fresh thyme, picked leaves (optional garnish)


  • Preheat the oven to 180°C (fan oven). This is 200°C for conventional ovens (or 400°F / gas mark 6).
  • Start with the butter. Pick the leaves off several thyme sprigs until you yield at least two teaspoons full. This can be easily done by simply running your fingers gently down the stalk in the opposite direction of the leaves' growth.
  • Add the leaves to the softened butter (which is simply butter left at room temperature for several hours). Use a garlic press to crush the garlic cloves into the bowl. (NOTE: I used a garlic press here to ensure I only yielded the lovely inner garlic flesh. Discard the bits left in the press between crushing each clove.)
  • Season the butter with salt and combine well before tipping out onto a sheet of cling film. Roll the butter in the cling film to form an even-sized 'mini log'. You will be slicing them into 4 thick discs later, so estimate here). Twist the ends and place in the fridge to set firm for at least 40 minutes while you preheat the oven to 180°C (fan oven). This is 200°C for conventional ovens (or 400°F / gas mark 6).
  • For the onions, place the peeled and halved onions into 4 individual squares of strong aluminium foil. Drizzle a teaspoon olive oil into each halved onion and ensure they are well coated. Season with salt and wrap tightly so you are left with 4 little foil parcels.
  • Place onto a baking tray and bake in the oven for 45 minutes.
  • Just before the onion's time is up, remove the little log of butter from the fridge, unwrap the cling film and slice into 4 even-sized thick discs.
  • Carefully unwrap the onions and discard the foil. Place the butter pieces onto the flat side of the hot onions (to melt) and scatter over any additional fresh thyme.

For those on INSTAGRAM, tag me @mkilianpalmer so we can all see your lovely creations! Keep scrolling: you can PIN this recipe for later, see detailed macros and browse other recipes in this category.
You can also drop me a comment if you have any questions about this recipe. I will do my best to reply as quickly as possible. Monya xxx


Calories: 154kcal | Carbohydrates: 5.9g | Protein: 0.9g | Fat: 14g

Baked Onions with Thyme Butter (Keto)
recipe image
Baked Onions with Thyme Butter (Keto)
Published On
Total Time
Average Rating
51star1star1star1star1star Based on 1 Review(s)

FOR READERS OUTSIDE THE UK: Missing anything you might need? The links on this website are directed at the UK market and show the products I use here. However, you can get everything you might need from Amazon.

Nutritional Information per serving
Calories                        154Kcal / 644kJ
Fat                                14g
Carbohydrates              5.9g
Protein                          0.9g


See all the Side Dishes on Fats of Life:

Load More

Disclaimer: The nutritional analysis, macro and allergen breakdown of the recipes on this site have been manually and carefully calculated using the cloud-based software NUTRITICS®. NUTRITICS® is fully approved by the relevant Trading Standards organizations and is EU and FDA-compliant. The macro calculations are provided as a courtesy to you based on the author's weighing of ingredients when creating the dishes. If Erythritol (a sugar polyol) has been used in any of the recipes, it has already been manually excluded from the final carbohydrate count. The author is a chef - not a medical professional - and this website has been designed to provide you with recipe ideas to suit the low carb lifestyle you have discussed with your GP.
Disclosure: Like many blogs, Fats of Life is part of the Affiliates Program on Amazon. The links to the products recommended here are affiliate links, meaning - at no additional cost to you - the author will earn a small commission if you click through and make a purchase.

1 Comment

Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.