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Keto Oven Baked Steak with Garlic Thyme Portabella Mushrooms

Louise | December 17
Keto Oven Baked Steak with Garlic Thyme Portabella Mushrooms #keto

There isn’t a much more satisfying dinner than a nice juicy steak and this Keto oven baked steak with garlic thyme portabella mushrooms is sure to satisfy and fill you up. This steak comes together like a dream. Just season with salt and pepper, sear on both sides and cook in the oven until it reaches your perfect doneness. And don’t forget the mushrooms! These are not your everyday mushroom, they are roasted with garlic and thyme until their meaty flavor comes out, the perfect complement to your steak. Together, the mushrooms and the steak make the perfect pair for any fancy dinner. Giant baked mushrooms cooked to perfection and served over a good steak. A fresh, green avocado salad on the side – THIS is why we love keto!

Picking the Perfect Steak

It can be hard to pick out the right steak, especially if you are a steak-cooking amateur. But don’t worry, we have a few tips that will have you buying steak like a pro whether it’s your first time or your fiftieth.

  1. Get to know your butcher – This tip is the equivalent of ‘phone-a-friend’ for meat buying. There is no one who knows meat better than your butcher so if you don’t know the best cut, don’t be afraid to ask. Your butcher does this for a living and every butcher I’ve met is happy to share their secrets with their customers.
  2. Look for color – Good steak has a deep red color, though grass fed beef is darker than grain finished. The fat should be creamy white or pale yellow. There should be no brown spots in the fat or on the edges of the beef.
  3. Marbling magic – Marbling is what gives your steak it’s moisture and flavor. Always look for small flecks of fat that are well distributed and evenly spread through the whole steak. It is the fat in the middle of the steak that gives the best flavor.

Tips for Cooking Steak

  • Start at room temp – Always make sure that your steak is at room temperature before you start cooking. This ensures that the steaks will cook evenly and won’t dry out while cooking.
  • Cast iron is king – If you have it a cast iron pan makes oven baking your steak a breeze. Get great caramelization for your crust and bake your steak in the same pan.
  • Take the temp – If you don’t have an instant read thermometer in your kitchen already, this is an excellent time to purchase one. A thermometer is the best way to ensure that your steak reaches the perfect doneness without any fuss.

More Low-Carb Mushroom Recipes

If you love mushrooms, keep reading. You’ll love these three Keto recipes with mushrooms.

  1. Keto Creamy Mushroom “Risotto
  2. Keto Spinach Mushroom Bacon Saute
  3. Keto Chicken Mushroom Casserole

Keto Oven Baked Steak with Garlic Thyme Portabella Mushrooms #keto

Keto Oven Baked Steak with Garlic Thyme Portabella Mushrooms #keto

Keto Oven Baked Steak with Garlic Thyme Portabella Mushrooms

  • Author: Louise Hendon
  • Prep Time: 10 minutes
  • Cook Time: 15 minutes
  • Total Time: 25 minutes
  • Yield: 2 servings 1x
  • Category: Dinner
  • Cuisine: American


Juicy steak and mushrooms, yes please!


  • 2 Tablespoons of olive oil (30 ml)
  • 4 portabella mushrooms (300 g)
  • 46 sprigs of thyme with the leaves removed
  • 2 beef filet mignons (400 g) (or choose another steak)
  • 1 Tablespoon of garlic powder (10 g)
  • Salt and pepper, to taste


  1. Preheat oven to 320°F  (160°C).
  2. Place the portabella mushrooms on a greased roasting tray and drizzle a tablespoon of olive oil over it. Sprinkle the garlic powder evenly over all four and scatter over the picked thyme leaves. Season with salt and freshly ground black pepper and place in the oven for 15 minutes. (When done, tip them to one side to allow excess moisture to run off.)
  3. Season the steaks with salt.
  4. Add one tablespoon olive oil to a large frying pan and sear both sides of the steaks so that a golden crust forms on all sides.  Place the steaks on a rimmed baking tray and place into the preheated oven for 8-10 minutes until the center of the steak reaches 130 F for medium rare or 140 F for medium.  Rest for 10 minutes before serving.


All nutritional data are estimated and based on per serving amounts.

Net Carbs: 3 g


  • Calories: 733
  • Sugar: 1 g
  • Fat: 56 g
  • Carbohydrates: 10 g
  • Fiber: 7 g
  • Protein: 42 g

Louise co-founded Louise's Foods, Paleo Living Magazine, Nourishing Brands, & CoBionic. She has considerable research experience but enjoys creating products and articles that help move people just a little bit closer toward a healthy life they love.