Low-Carb Brie and Caramelized Onion Tartlets
- Ready in 1h
- 2.1 g net carbs
- 169 kcal
- Serves 12
This post may contain affiliate links, see our disclaimer.

These delicious little keto tarts are bound to be a hit at your next Easter party or any special occasion — I recently took them to a baby shower as they were gone as soon as the plate hit the table!
There’s something about the sweet onion paired with the creamy brie encased in crispy low-carb, grain-free tart shells that makes these incredibly moreish — just make sure you grab yourself one before they’re all gone!
Step-by-step
Preheat the oven to 180 °C/ 355 °F (conventional), or 160 °C/ 320 °F (fan assisted).
Heat the oil in a frying pan over medium heat. Add the onions, and cook, stirring occasionally until the onions start to soften, around 12-15 minutes.
Lower heat, add vinegar, sweetener and salt, and cook, continuing to stir occasionally, until dark and caramelised.

While the onions are cooking, press the pie crust into 12 greased muffin tins. Tip: Instead of 12 mini tartlets you can make 1 large tart.
Bake 10 minutes, and then remove and allow to cool slightly. Once cooled slightly, divide the onions evenly among the tart cases.
Chop the brie into 12 even pieces, and top the onion. Scatter with the herbs.

Bake for 15 minutes or until the brie has softened and the tops are starting to brown.
Serve immediately or store in the fridge for up to 5 days. To serve, gently reheat in the oven or eat cold.


Recipe
Low-Carb Brie and Caramelized Onion Tartlets
★★★★★4.8Delicious mini low-carb tarts filled with sweet caramelized onions, baked brie and fresh herbs.
- Hands on
- 30m
- Overall
- 1h
- Servings
- 12
- 2.1 g
- Net carbs
- 10.5 g
- Protein
- 11.6 g
- Fat
- 169
- kcal
Ingredients makes 12 tartlets
- Pie crust:
- Cheese filling:
Instructions
Preheat the oven to 180 °C/ 355 °F (conventional), or 160 °C/ 320 °F (fan assisted).
Heat the oil in a frying pan over medium heat. Add the onions, and cook, stirring occasionally until the onions start to soften, around 12-15 minutes.
Lower heat, add vinegar, sweetener and salt, and cook, continuing to stir occasionally, until dark and caramelised.
While the onions are cooking, press the pie crust into 12 greased muffin tins. Tip: Instead of 12 mini tartlets you can make 1 large tart.
Bake 10 minutes, and then remove and allow to cool slightly. Once cooled slightly, divide the onions evenly among the tart cases.
Chop the brie into 12 even pieces, and top the onion. Scatter with the herbs.
Bake for 15 minutes or until the brie has softened and the tops are starting to brown.
Serve immediately or store in the fridge for up to 5 days. To serve, gently reheat in the oven or eat cold.
Nutrition per tartlet
Carbs 5%Protein 27%Fat 68% of calories
- Net carbs
- 2.1 g
- Total carbs
- 4.8 g
- Fiber
- 2 g
- Sugars
- 1.4 g
- Protein
- 10.5 g
- Fat
- 11.6 g
- Saturated fat
- 2.6 g
- Calories
- 169 kcal
- Sodium
- 179 mg · 7.78% RDA
- Magnesium
- 39 mg · 9.66% RDA
- Potassium
- 154 mg · 7.68% EMR
Nutrition by ingredient
| Per tartlet | Net carbs | Protein | Fat | kcal |
|---|---|---|---|---|
| Savory Keto Pie Crust (KetoDiet blog) | 0.9 g | 8.8 g | 7.3 g | 118 |
| Onion, red, fresh | 1.1 g | 0.2 g | 0 g | 7 |
| Olive oil, extra virgin | 0 g | 0 g | 2.3 g | 20 |
| Sukrin Gold, brown sugar substitute | 0.1 g | 0 g | 0 g | 0 |
| Salt, sea salt | 0 g | 0 g | 0 g | 0 |
| Cheese, brie | 0 g | 1.5 g | 2 g | 24 |
| Thyme, fresh | 0 g | 0 g | 0 g | 0 |
| Total | 2.1 g | 10.5 g | 11.6 g | 169 |
Serving size tartlet
- Gluten free
- Egg free
- Nightshade free
- Pork free
- Avocado free
- Coconut free
- Fish free
- Shellfish free
- Pescatarian
- Vegetarian
You may also like

Easy Keto Mini Brie Tarts

Keto Goat Cheese Tarts with Caramelized Onion

Low-Carb Cheesy Spinach Stuffed Mushrooms

Rosemary & Parmesan Keto Crackers

Silky Smooth Keto Buttercream Frosting 4 Ways

Keto Marinated Cheese Balls

Easy Herbed Goat's Cheese Dip

Low-Carb No Bake Cheesecake Bars

Low-Carb Italian Melt Bread Pockets

Super Simple Keto Cheetos

Mackerel Pate with Horseradish

Keto Crostini Bread Crisps

Mushroom & Thyme Keto Bruschetta

Low-Carb Raspberry Baked Brie

Crispy Multiseed Keto Crackers

Keto Whoopie Pies
Comments & ratings (2)
What size tart pans did you use? I don't have any and need to buy some. I prefer using ceramic, but would use stainless steel if necessary.
Hi Carol, I believe these were 5 cm (2.5 inch) tart pans but you could use bigger and make fewer tarts.