Beef and Mushroom Stir-Fry with Garlic Butter Sauce

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A savory keto stir-fry featuring tender beef strips and earthy mushrooms cooked in a rich garlic butter sauce perfect for low-carb dinners. This asian-inspired keto (low carb, gluten free) ready in about 25 minutes blends thinly sliced beef sirloin, cremini, sliced mushrooms, unsalted butter into a versatile sauce that lifts everything from grain bowls and roasted vegetables to grilled proteins — a small-batch staple worth keeping in the fridge. Each serving lands at about 450 calories and feeds 3, so a small batch covers several meals across the week without taking over the fridge. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 15 min Serves 3 Asian cuisine 450 cal/serving
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Ingredients

Instructions

  1. Step 1: Heat 2 tbsp unsalted butter in a large skillet over medium-high heat until melted and shimmering. Add 12 oz thinly sliced beef sirloin and sauté for 3-4 minutes until browned but still tender. Remove beef and set aside.
  2. Step 2: In the same skillet, add 2 tbsp butter, then 8 oz sliced cremini mushrooms and 4 minced garlic cloves. Sauté for 5 minutes until mushrooms are golden and garlic is fragrant.
  3. Step 3: Return beef to the skillet, add 2 tbsp soy sauce, 1 tbsp sesame oil, 1/2 tsp salt, 1 tsp black pepper, and 1/4 tsp red pepper flakes if using. Stir-fry everything together for 2 minutes until sauce coats the ingredients well.
  4. Step 4: Remove from heat and garnish with 2 thinly sliced green onions. Serve immediately for a flavorful keto meal.

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Frequently asked questions

How long does Beef and Mushroom Stir-Fry with Garlic Butter Sauce take to make?

Total time is about 25 minutes (10 min prep + 15 min cook). A small batch typically covers several meals in the week — store as the recipe directs.

How do I store leftover Beef and Mushroom Stir-Fry with Garlic Butter Sauce?

Transfer to an airtight jar and refrigerate for up to 5–7 days. Most sauces freeze well for up to 2 months — portion into small containers or freezer bags so you can thaw only what you need. Stir before serving; cream- or yogurt-based sauces may separate on standing.

Can I substitute ingredients in Beef and Mushroom Stir-Fry with Garlic Butter Sauce?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Beef and Mushroom Stir-Fry with Garlic Butter Sauce for a different number of people?

The recipe is written for 3 servings. Multiply each ingredient by (your serving target / 3). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Beef and Mushroom Stir-Fry with Garlic Butter Sauce low carb?

Yes — this recipe is tagged low carb, gluten free based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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