1-Gather and Prep Ingredients: First, gather and prep ingredients to make the process easier. Trim 1 lb beef into thin strips, pat dry, and season lightly with salt and pepper; slice 8 oz mushrooms, finely chop 1 medium onion, and mince 2 garlic cloves. Measure 1 cup beef broth, 1/2 cup wine if using, 1 cup sour cream, and have 2 tablespoons flour and 2 tablespoons butter ready. Preparing everything first ensures quick searing and prevents the sauce from overcooking. For more ideas on prepping meats, check out beef preparation tips on our site.

2-Cook the Noodles or Starch: Next, cook the noodles or starch according to package directions so they finish just before serving. Reserve a cup of pasta water before draining; this helps adjust sauce consistency if needed. If using zucchini ribbons or cauliflower rice for a low-calorie option, briefly blanch or sauté them until tender-crisp; set aside.

3-Brown the Beef: Then, brown the beef in batches to keep it tender. Heat 1 tablespoon oil and 1 tablespoon butter in a large skillet over medium-high heat. Add seasoned beef in a single layer and sear 1 2 minutes per side until just browned; remove and keep warm. This step, as highlighted in the directions, involves searing in two batches to avoid overcrowding, which helps achieve that perfect golden color.

4-Sauté Onions and Mushrooms: After that, sauté onions and mushrooms for added depth. Add another tablespoon of butter, then cook the chopped onion for 4 6 minutes until translucent. Add mushrooms and cook 5 7 minutes until golden; stir in minced garlic for about 30 seconds to build umami.

5-Deglaze and Build the Sauce: Now, deglaze and build the sauce for creaminess. Sprinkle 2 tablespoons flour over the mixture and cook 1 minute. Pour in 1/2 cup white wine or broth and scrape up bits; add 1 cup beef broth, bring to a simmer, and reduce 3 5 minutes until thickened.

6-Finish the Sauce and Reheat the Beef: Finally, finish the sauce and reheat the beef gently. Lower heat, stir in 1 tablespoon Dijon mustard and 1 teaspoon Worcestershire sauce, then remove from heat before adding sour cream; whisk until smooth. Return beef to the pan and warm through for 2 3 minutes. Drawing from the original directions, temper the sour cream first to keep the sauce creamy and smooth.

7-Adjust Seasoning and Texture: At this point, adjust seasoning and texture to taste. Add salt, pepper, or pasta water as needed for the right consistency.

8-Serve and Garnish: Serve right away for the best flavor. Spoon over noodles and garnish with parsley, as suggested?in the tips for enhancing flavors with simple sides.