Pan-Seared Beef Tenderloin with Garlic Mushroom Butter

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

Tender beef tenderloin seared to perfection and finished in a rich garlic-mushroom butter sauce, perfect for a quick keto dinner. This american-inspired beef (low-carb) ready in about 30 minutes pairs beef tenderloin, butter, olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 226 calories and feeds 2, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. 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: 15 min Cook: 15 min Serves 2 American cuisine 226 cal/serving
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Ingredients

Instructions

  1. Step 1: Pat the 6 oz beef tenderloin dry with paper towels and season evenly with 1/4 tsp salt and 1/8 tsp black pepper on both sides.
  2. Step 2: Heat 1 tsp olive oil and 1/2 tbsp butter in a large skillet over medium-high heat until butter foams.
  3. Step 3: Add the beef and sear for 3 minutes per side until golden brown, then transfer to a plate and rest.
  4. Step 4: Add the 1 cup sliced mushrooms to the skillet and cook for 4 minutes until they release liquid and brown slightly.
  5. Step 5: Add the 2 minced garlic cloves and 1 tsp fresh thyme, stirring for 1 minute until fragrant.
  6. Step 6: Return the beef to the skillet, reduce heat to medium, and cook for 2 minutes until warmed through, then slice and serve with the mushroom sauce.

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Frequently asked questions

How long does Pan-Seared Beef Tenderloin with Garlic Mushroom Butter take to make?

Total time is about 30 minutes (15 min prep + 15 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Pan-Seared Beef Tenderloin with Garlic Mushroom Butter?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep beef tenderloin from drying out.

Can I substitute ingredients in Pan-Seared Beef Tenderloin with Garlic Mushroom Butter?

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 Pan-Seared Beef Tenderloin with Garlic Mushroom Butter for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). 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 Pan-Seared Beef Tenderloin with Garlic Mushroom Butter low-carb?

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

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