Beef and Asparagus Casserole with Mustard Sauce

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

A comforting baked casserole featuring ground beef, crisp asparagus, and a tangy mustard sauce, perfect for a low-carb weeknight meal. This american-inspired beef (low-carb) ready in about 40 minutes pairs Ground beef, Asparagus, Onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 400 calories and feeds 4, 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.

★ 4.4 (12 ratings) Prep: 15 min Cook: 25 min Serves 4 American cuisine 400 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). In a large skillet over medium heat, cook ground beef, onion, and garlic until beef is browned and onion is translucent, about 8 minutes.
  2. Step 2: Stir in 2 tbsp Dijon mustard and cook for 1 minute to blend flavors.
  3. Step 3: Remove skillet from heat and stir in 1/2 cup heavy cream, 1 beaten egg, 1/4 tsp salt, and 1/4 tsp black pepper.
  4. Step 4: Add 12 oz chopped asparagus to the mixture and stir until evenly coated.
  5. Step 5: Transfer to a 9x9-inch baking dish, top with 1/2 cup shredded cheddar cheese, and bake for 25 minutes until cheese is melted and bubbly.
  6. Step 6: Let rest for 5 minutes before serving to allow sauce to set.

Frequently asked questions

How long does Beef and Asparagus Casserole with Mustard Sauce take to make?

Total time is about 40 minutes (15 min prep + 25 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 Beef and Asparagus Casserole with Mustard 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 ground beef from drying out.

Can I substitute ingredients in Beef and Asparagus Casserole with Mustard 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 Asparagus Casserole with Mustard 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.

Is Beef and Asparagus Casserole with Mustard Sauce 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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