Oven-Roasted Sirloin with Mustard Cream Sauce

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

Tender sirloin roast oven-roasted and served with a tangy keto-friendly mustard cream sauce. This French-inspired beef recipe (keto, low carb), ready in about 60 minutes, pairs sirloin roast, salt, black pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 380 calories and feeds 6, so it slots cleanly into a low-carb week and pairs well with cauliflower rice or roasted green vegetables. 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: 50 min Serves 6 French cuisine 380 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F. Rub 2 lbs sirloin roast with 2 tbsp olive oil, 1 1/2 tsp salt, and 1 tsp black pepper evenly.
  2. Step 2: Place roast on a rack in a roasting pan and cook in preheated oven for 40-45 minutes or until internal temperature reaches 135°F for medium-rare.
  3. Step 3: Remove roast from oven and tent loosely with foil; let rest for 10 minutes.
  4. Step 4: Meanwhile, whisk together 1/2 cup heavy cream, 2 tbsp Dijon mustard, and 1/2 tsp garlic powder in a small saucepan. Heat over low heat for 3 minutes until warm and slightly thickened.
  5. Step 5: Slice sirloin roast thinly and drizzle with mustard cream sauce. Garnish with 1 tbsp chopped fresh parsley before serving.

Frequently asked questions

How long does Oven-Roasted Sirloin with Mustard Cream Sauce take to make?

Total time is about 60 minutes (10 min prep + 50 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 Oven-Roasted Sirloin with Mustard Cream Sauce?

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 sirloin roast from drying out.

Can I substitute ingredients in Oven-Roasted Sirloin with Mustard Cream 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 Oven-Roasted Sirloin with Mustard Cream Sauce for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). 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 Oven-Roasted Sirloin with Mustard Cream Sauce keto?

Yes — this recipe is tagged keto, 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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