Garlic-Pepper Beef Tenderloin with Mushroom Sauce
Tender beef tenderloin seared with garlic and black pepper, finished with a savory mushroom sauce. A luxurious keto dinner that's surprisingly simple to make. This american-inspired keto ready in about 45 minutes blends beef tenderloin, olive oil, minced garlic 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 520 calories and feeds 4, 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.
Ingredients
- 1.5 lbs beef tenderloin
- 2 tbsp olive oil
- 3 cloves, minced garlic
- 1 tsp black pepper
- 8 oz, sliced mushrooms
- 2 tbsp unsalted butter
- 1/4 cup heavy cream
- 1 tsp dijon mustard
- 2 tbsp, chopped chives
- 1/2 tsp salt
Instructions
- Step 1: Season beef tenderloin with 1 tsp black pepper and 1/2 tsp salt. Heat 2 tbsp olive oil in a large skillet over medium-high heat until shimmering.
- Step 2: Sear the beef tenderloin for 3-4 minutes per side until a golden crust forms. Remove from skillet and let rest for 10 minutes before slicing.
- Step 3: In the same skillet, add 3 minced garlic cloves and cook for 30 seconds until fragrant. Add 8 oz sliced mushrooms and cook for 5 minutes until mushrooms release their liquid and brown.
- Step 4: Reduce heat to medium-low, then stir in 2 tbsp unsalted butter, 1/4 cup heavy cream, and 1 tsp dijon mustard. Simmer for 2-3 minutes until sauce thickens slightly.
- Step 5: Slice the rested beef tenderloin and serve with the mushroom sauce, garnished with 2 tbsp chopped chives.
Frequently asked questions
How long does Garlic-Pepper Beef Tenderloin with Mushroom Sauce take to make?
Total time is about 45 minutes (20 min prep + 25 min cook). A small batch typically covers several meals in the week — store as the recipe directs.
How do I store leftover Garlic-Pepper Beef Tenderloin with Mushroom 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 Garlic-Pepper Beef Tenderloin with Mushroom 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 Garlic-Pepper Beef Tenderloin with Mushroom Sauce for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). 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.
What goes well with Garlic-Pepper Beef Tenderloin with Mushroom Sauce?
American keto like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★★
Loved it! Simple and perfect for a special meal.
- ★★★★★
Made this for my husband's birthday. The beef was juicy and the mushroom sauce was creamy and delicious. He loved it!
- ★★★★★
This was the most tender beef I've ever cooked! My family loved it, and it's perfect for keto dinners.
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