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Keto Caramelized Onion & Brie Galette

4.4 stars, average of 7 ratings

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Galette is an open-face pastry that can be stuffed with sweet or savory options. This Christmas galette is filled with a festive combination of sweet caramelized balsamic onions and creamy brie cheese. It's the perfect dinner option for the holidays!

The dough is very fragile but as long as it's properly chilled, it will be easy to roll out and work with. I prefer freezing the dough rather than refrigerating as it's faster. Once after making the dough and then again briefly after rolling it out.

The filling is made with sweet caramelized onions cooked with balsamic vinegar, thyme and low-carb sweetener. I used Allulose, which caramelizes just like sugar, but you can use other options such as Erythritol, Swerve or Xylitol.

One serving may look quite small but I can assure you that it's very filling. You can always serve it with a simple side salad of a bowl of dressed greens.

If you're watching your carb intake, avoid thick, aged balsamic vinegar as it's quite high in sugar. To learn more about vinegar, the best options for a low-carb diet and health effects, read this article: Beyond Diabetes Health Benefits of Vinegar.

If you like galettes, try this savory Mushroom & Ricotta Keto Galette and Low-Carb Roasted Tomato Galette or Low-Carb Summer Berry Galette for a sweet option.

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Hands-on Overall

Serving size 1 slice

Allergy information for Keto Caramelized Onion & Brie Galette

✔  Gluten free
✔  Nightshade free
✔  Pork free
✔  Avocado free
✔  Fish free
✔  Shellfish free
✔  Beef free

Nutritional values (per serving, 1 slice)

Net carbs8.5 grams
Protein20.3 grams
Fat56.9 grams
Calories635 kcal
Calories from carbs 5%, protein 13%, fat 82%
Total carbs15.9 gramsFiber7.4 gramsSugars5.6 gramsSaturated fat23.1 gramsSodium281 mg(12% RDA)Magnesium126 mg(31% RDA)Potassium460 mg(23% EMR)

Ingredients (makes 6 servings)

  • 2 large red onions (300 g/ 10.6 oz)
  • 1/2 stick unsalted butter (57 g/ 2 oz)
  • 1 tbsp balsamic vinegar (15 ml)
  • 1 tbsp Allulose or Erythritol (10 g/ 0.4 oz)
  • 1 tsp fresh thyme, plus more for garnish
  • 1 round brie cheese, sliced (200 g/ 7.1 oz)
  • 2 1/2 cups almond flour (250 g/ 8.8 oz)
  • 4 tbsp coconut flour (32 g/ 1.1 oz)
  • 2 tsp xanthan gum
  • pinch of sea salt
  • 1 stick cold unsalted butter (113 g/ 4 oz)
  • 2 large eggs, plus 1/2 egg for brushing on top


  1. Peel and slice the red onions. Place the butter in a hot skillet and let it melt over a low heat. Add the onions and fry on medium heat for 15 minutes. Keto Caramelized Onion & Brie Galette
  2. Add the balsamic vinegar, Allulose (or Erythritol) and thyme leaves. Gently cook on low-medium heat for 30 to 40 minutes, stirring regularly, until completely soft and caramelized. When done, set aside. Keto Caramelized Onion & Brie Galette
  3. To make the crust, place the almond flour, coconut flour, xanthan gum, salt and cold butter into a food processor. Keto Caramelized Onion & Brie Galette
  4. Add 2 eggs and process until smooth dough forms. Keto Caramelized Onion & Brie Galette
  5. Wrap in a piece of cling film, flatten with your hands and refrigerate for 1 to 2 hours or freeze for 20 to 30 minutes, until firm and easy to roll out. Keto Caramelized Onion & Brie Galette
  6. When the dough is ready, place it on a strong piece of parchment paper. Roll the dough into an oval, flat crust, about 40 x 30 cm (15 x 11 inch). To prevent the dough from sticking, use a silicon covered rolling pin or wrap it in a piece of cling film. The crust will be fragile when the dough warms up. Carefully transfer into the freezer for 10 minutes or in the fridge for 30 minutes.
  7. Meanwhile, slice the brie. If you want the brie to be less melted once you bake it, place the slices on a tray lined with parchment paper and freeze for 15 minutes. Keto Caramelized Onion & Brie Galette
  8. Transfer the chilled dough in a large baking tray. Add most of the caramelized onion on top of the crust, leaving about 5 cm (2 inches) from the sides uncovered. Add sliced brie and then the remaining caramelized onions. Keto Caramelized Onion & Brie Galette
  9. Preheat the oven to 180 °C/ 355 °F (fan assisted), or 200 °C/ 400 °F (conventional). Beat the remaining egg. Fold the dough over the filling and then brush the edges with the remaining beaten egg. Place in the oven and bake for 15 minutes, rotating the tray halfway to ensure even browning. Keto Caramelized Onion & Brie Galette
  10. Remove from the oven and set aside to cool down for a few minutes before slicing. Optionally, garnish with fresh herbs such as thyme or basil and serve with a bowl of dressed greens. Eat warm or cold. To store, refrigerate for up to 5 days. Keto Caramelized Onion & Brie Galette

Ingredient nutritional breakdown (per serving, 1 slice)

Net carbsProteinFatCalories
Onion, red, fresh
3.3 g0.6 g0.1 g20 kcal
Butter, unsalted, grass-fed
0 g0.1 g7.6 g68 kcal
Balsamic vinegar, dark (excludes sweet, syrupy vinegar)
0.5 g0 g0 g2 kcal
Allulose, natural low-carb sweetener
0.1 g0 g0 g0 kcal
Thyme, fresh
0 g0 g0 g0 kcal
Cheese, brie
0.2 g6.9 g9.2 g111 kcal
Almond flour (blanched ground almonds, almond meal)
3.7 g8.9 g21.9 g246 kcal
Coconut flour, organic
0.6 g0.9 g0.8 g20 kcal
Xanthan gum, thickening agent
0 g0 g0 g3 kcal
Salt, sea salt
0 g0 g0 g0 kcal
Psyllium husk powder
0.1 g0 g0 g1 kcal
Butter, unsalted, grass-fed
0 g0.2 g15.3 g135 kcal
Egg, whole, fresh, raw (free-range or organic eggs)
0.2 g2.6 g2 g30 kcal
Total per serving, 1 slice
8.5 g20.3 g56.9 g635 kcal

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Martina Slajerova
Creator of

Martina Slajerova

I changed the way I ate in 2011, when I was diagnosed with Hashimoto’s, an autoimmune disease that affects the thyroid. I had no energy, and I found it more and more difficult to maintain a healthy weight.

That’s when I decided to quit sugar, grains, and processed foods, and to start following a whole-foods-based ketogenic approach to food.

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Comments (4)

What is the temperature to bake in a conventional oven? I am baking at 350F and hoping it goes well. Looking forward to tasting it!

Hi Michelle, I just added instructions for convention and fan oven (I'm not sure how I missed that!). I baked mine at 180 C fan for 15 minutes.

Just wanted to let you know that my wife and I tried this recipe the other night. It so happens that my inlaws were there too. They like the recipe so much that they ask for the leftovers to go!
Anyways, thanks a lot for sharing this. Excited to send the next recipe here to my wife.
Have a great day!

Thank you so much Timothy, I'm glad you all enjoyed! 😊