Sauteed mushrooms with onions make a flavorful, low-carb side or a savory topping for many keto meals. This simple dish is quick to prepare, versatile, and easy to customize to your taste.
Mushrooms have a rich, earthy flavor that intensifies when they are browned. In this recipe, sliced mushrooms are cooked with diced onions in a blend of butter and olive oil, then finished with garlic and tamari for a well-rounded, savory profile. Serve them on their own, sprinkle with chopped parsley, or add a dusting of freshly grated Parmesan for extra depth.
About the mushrooms
I used cremini mushrooms for their robust flavor and firm texture, but white button mushrooms work well too. Mushrooms are naturally low in calories and carbs, making them a great choice for keto and other low-carb diets. They are delicious raw in salads or cooked: sautés like this highlight their savory qualities, and they also pair nicely in soups, casseroles, and egg dishes.
Ingredients and flavor notes
The base of butter and olive oil creates a rich, slightly nutty foundation for the mushrooms and onions. I used salted butter and a couple teaspoons of tamari, which adds a mild umami saltiness; taste the dish and adjust salt and pepper as needed. Fresh garlic adds brightness—three minced cloves are suggested, but use more if you like a stronger garlic presence, or substitute with a light sprinkle of garlic powder. For a touch of heat, add red pepper flakes or a few dashes of hot sauce.
Serving suggestions
These sauteed mushrooms and onions are extremely versatile. Serve them as a side with beef, chicken, pork, or seafood, or use them as a topping for grilled meats and roasts. They work well on keto burgers, sandwiches, or spooned over roasted vegetables. For a low-carb pasta option, consider pairing with shirataki noodles or hearts of palm pasta. Finish with fresh chopped parsley or freshly grated Parmesan; Asiago or Pecorino Romano are fine alternatives, and shaving the cheese creates larger, visually appealing pieces.
More mushroom-based keto ideas
If you enjoy mushrooms, try them in creamy mustard sauces, paired with pasta substitutes for a hearty bowl, or included in marinated salads and mixed vegetable sautés. They adapt well to many seasonings and cooking methods, so feel free to experiment with herbs, cheeses, and different acids like a splash of lemon juice or a bit of vinegar to brighten the dish.
Here are a few recipe concepts to explore: creamy Dijon mushroom sauce for meats, a mushroom “linguine” using low-carb noodles, a marinated mushroom and olive salad, and a mixed peppers-and-onions sauté to complement the mushrooms.
Helpful hints
* Cremini mushrooms offer a deeper flavor, but white button mushrooms are a fine substitute.
* Reheat leftovers gently in a skillet over medium heat or briefly in the microwave to preserve texture and flavor.
Main kitchen equipment and utensils
- Large skillet or sauté pan
- Measuring spoons
Recipe card
Sauteed Mushrooms with Onions
4 Servings
10 minutes
10 minutes
20 minutes
Simple, savory sauteed mushrooms and onions that pair with a wide range of low-carb meals.
Ingredients
- 1 tablespoon butter
- 1 tablespoon olive oil
- 16 ounces mushrooms, sliced
- ¼ cup diced red onions (or yellow onion)
- 3 garlic cloves, minced
- 2 teaspoons tamari (adjust to taste)
- Optional: fresh chopped parsley or freshly grated Parmesan
Instructions
- Heat a large skillet over medium-high heat and melt the butter with the olive oil.
- Add the sliced mushrooms and diced onions. Cook, stirring occasionally, for 8–10 minutes until the mushrooms are golden and the onions are soft.
- Add the minced garlic and tamari during the last minute of cooking. Stir to combine and heat through.
- Serve immediately. Top with chopped parsley or freshly grated Parmesan if desired.
Nutrition Information:
Yield: 4
Serving Size: 1
Amount Per Serving (approx.):
Calories: 89
Total Fat: 7g
Carbohydrates: 5g
Fiber: 1g
Protein: 4g
Nutrition figures are estimates and will vary by ingredients and brands used.
A word of encouragement
Fight the good fight of faith, lay hold on eternal life, to which you were also called and have confessed the good confession in the presence of many witnesses. 1 Timothy 6:12