Keto Brie and Thyme Stuffed Portobello Mushrooms with Crisped Shallots

by Clean Keto Lifestyle

These Keto Brie and Thyme Stuffed Portobello Mushrooms with Crisped Shallots are a showstopper side dish or appetizer! The thyme compliments the earthiness of the mushrooms and the buttery flavor of the brie cheese. These mushrooms are keto, low-carb, grain-free, and gluten-free!

Keto Portobello

Keto Portobello Mushrooms

These Keto Brie and Thyme Stuffed Portobello Mushrooms makes an impressive appetizer, side dish, and even dinner.

Is is also incredibly easy to prepare and would make an excellent main course for your vegetarian friends or family members at Thanksgiving, or any another holiday meal for that matter.

We love serving these with a red wine pairing for cocktail hour before Thanksgiving or Christmas dinner.

Keto Portobello Mushrooms and Brie Cheese

All About Portobello Mushrooms

Portobello mushrooms are large mushrooms with caps that are approximately 3-4 inches in diameter.

You will usually find them pre-packaged in the produce section of the grocery store (near all the other mushrooms).

Portobello mushroom caps have a meaty quality that gives them a hearty taste and makes the perfect to stuff, fill, and top.

They also make a great keto burger bun!

Keto Portobello Mushrooms and Brie Cheese

Are Portobello Mushrooms Keto?

Yes! One portobello mushroom cap has only 3 net carbs (6 grams total carbs less 3 grams fiber).

Plus, they are perfect for clean keto because they are rich in vitamins and nutrients including thiamin, Vitamin B6, folate, magnesium, zinc and manganese. 

Mushrooms also have protein in them. Each cap has 5 grams of protein in them.  

Keto Portobello Mushrooms and Brie Cheese

How to Cook Keto Portobello Mushrooms

Portobello mushroom caps can be roasted or grilled.

Since they don't have much natural flavor, we also recommend coating them in a combination of oil and vinegar or marinating them before cooking. Don't marinate them for more than 15 minutes or they can get soggy and slimy.

For this recipe, we are roasting the mushroom caps in the oven, but on a warm night they’re great on a grill, too!

Keto Portobello Mushrooms and Brie Cheese

Ingredients in Our Stuffed Portobello Mushrooms

What's great about this recipe is that you only need a few items to make these!

What Equipment You Need:

Let's get cooking!

Keto Portobello Mushrooms

Make The Crisped Shallots

In a small skillet over medium heat, add in 1 tablespoon of avocado oil.

Add the shallots and saute for a couple minutes, then turn the heat down to low and cook for 15 more minutes or until the shallots are crisped and caramelized.

Transfer the shallots to a plate and set aside.

PRO TIP: The shallots will continue to dry and crisp after they are removed from the skillet.

Crisped Shallots

Prepare Your Keto Portobello Mushroom 

Wipe the Portobello mushroom caps clean with a damp cloth. Then use a knife to remove the mushroom gills and stems. 

Discard the gills and then chop just the stems into small pieces and saute them in a skillet.

In a small bowl, mix together the balsamic and remaining avocado oil.

Coat the mushroom caps on both sides with the balsamic mixture and place them cap-side down on the lined baking sheet.

Sprinkle fresh thyme leaves over the caps and bake the mushrooms for 10 minutes at 425°F.

Keto Portobello Mushrooms

Add Your Cheese 

After 10 minutes, remove from the oven and evenly top each mushroom with the brie cheese cubes.

Sprinkle on the sauteed chopped mushroom stems, the coarse salt, and the remaining thyme leaves.

Turn the oven down to 350°F and bake again for 5 minutes or until the brie is melted.

Keto Portobello Mushrooms and Brie Cheese

Keto Portobello Mushroom Finishing Touches

Remove the mushrooms from the oven and top with the crisped shallots. 

Transfer to a plate or platter and serve immediately.

Keto Portobello Mushrooms and Brie Cheese

What to Serve With This Dish

This the perfect fall-inspired side dish for a Thanksgiving dinner – here are our top picks to make your Thanksgiving unforgettable! 

First and foremost, a juicy flavorful Keto Turkey with Garlic and Herb Compound Butter!

Side Dishes:


Have a fabulous Thanksgiving!! 

Keto Portobello Mushrooms and Brie Cheese


Like what you see? Follow us on Instagram and Facebook! Love this recipe? Hit the Pin button below and share it with your friends! Make sure you don’t miss new recipes by subscribing to our mailing list below!


We Can't Wait To See You Try It!

We love seeing our recipes come to life!! We can’t wait to see how you make these and loving seeing each person's unique spin on it! Tag us on Instagram @cleanketolifestyle or use the hashtag #CKLrecipe!

Make Sure To Save This Recipe or Share It!

0 comment

You may also like

Leave a Comment

This website uses cookies to improve your experience. If you continue to use this site, we'll assume you're OK with this, but you can opt-out. Accept Read More


ckl 21 ultimate KETO accelerator plan

Turn Your Body Into A Fat-Burning Machine With This 21-DAY KETO ACCELERATOR PROGRAM!