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Keto Beef Stroganoff

Cozy keto beef stroganoff — tender London broil or sirloin with lupini noodles in a creamy sauce of sour cream, mushrooms, onion, and beef broth. 8.5g net carbs, 37g protein, and surprisingly easy to make.
  • 8.5gnet carbs
  • 37gprotein
  • 30minutes
  • 6servings

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Keto beef stroganoff has always been one of those comfort food meals that takes me right back to my childhood. My mom used to make beef stroganoff when I was growing up, and it was easily one of my favorite dinners she made. For this low-carb version, I took some of the elements I loved from her recipe and kept things simple with thinly sliced London broil or sirloin steak, mushrooms and onions simmered in a creamy sour cream and beef broth sauce. Best of all, the whole meal comes together in about 30-35 minutes, so it’s easy enough for a weeknight dinner.

A wooden spoon holding creamy keto beef stroganoff with mushrooms, steak, and fusilli pasta in a skillet.

While a lot of keto beef stroganoff recipes use ground beef, I really prefer using strips of steak. You get those tender, juicy pieces of beef throughout the dish, which gives it more of that traditional stroganoff flavor and texture I remember from my mom’s recipe. The sauce is simple, too. You don’t need a long list of ingredients to get a rich, savory sauce when you have the combination of beef broth, sautéed mushrooms, onions and sour cream.

I like to serve my keto beef stroganoff with low-carb lupini noodles because they give you that classic beef-and-noodles experience while keeping the carbs down. If you don’t want to use low-carb pasta, spoon the creamy beef and mushroom mixture over cauliflower rice or serve it alongside fried zucchini. Either way, it’s an easy, satisfying low-carb dinner that still tastes like the comfort food I grew up eating.

Creamy keto beef stroganoff with tender steak, mushrooms, and low carb rotini pasta served straight from a skillet.

Storage information

I store leftovers in an airtight container in the refrigerator for up to 3-4 days.

To reheat, I warm the stroganoff gently in a skillet over low heat or in the microwave until heated through. The sauce will thicken as it sits, so I usually add a splash of beef broth while reheating to loosen it up and bring back that creamy consistency.

How can I lower the carbs?

The biggest sources of carbs in your recipe are going to be the lupini noodles, cornstarch, onion, mushrooms, and sour cream, so I’d focus mostly on the noodles and cornstarch rather than cutting flavorful vegetables.

To make this keto beef stroganoff even lower in carbs, I skip the lupini noodles and serve the creamy beef and mushroom mixture over cauliflower rice, zucchini noodles or fried zucchini instead.

You can also leave out the cornstarch used to coat the steak and simply let the sauce simmer for a few extra minutes to thicken, or use a small amount of arrowroot powder if you prefer a thicker sauce, or substitute the cornstarch with cream cheese.

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The recipe

Keto Beef Stroganoff

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Prep 10 min Cook 20 min Total 30 min Serves 6

Ingredients

Servings 6

Keto Beef Stroganoff Ingredients

Step by Step Instructions

  1. Slice the beef

    Pat steak dry with a paper towel. Slice beef into bite sized strips.

    For this step

    • 1 to 1.25 pound London broil or sirloin steak
    Beef steak sliced into thin bite-sized strips on a cutting board for keto beef stroganoff.
  2. Season steak

    In a small bowl, combine cornstarch, salt and pepper. Place steak into a large bowl and sprinkle cornstarch mixture over the top. Toss to evenly coat. 

    For this step

    • 1 tablespoon cornstarch
    • 1 teaspoon salt
    • 1 teaspoon ground black pepper
    Sliced beef strips tossed with cornstarch and seasonings in a glass mixing bowl.
  3. Sear the beef

    Heat butter in a large skillet over medium high heat. Add beef and sear on all sides until browned. Work in two batches so as to not over crowd the skillet. Remove meat; set aside.

    For this step

    • 1/4 cup butter
    Seasoned beef strips browning in melted butter in a large skillet.
  4. Add veggies

    Reduce heat to medium. To the skillet, add onion and mushrooms. Stirring occasionally, cook for 5 minutes or until onion is softened.

    For this step

    • 1/4 medium onion, chopped
    • 8 oz sliced mushrooms
    Sliced mushrooms and onions sautéing in a skillet until browned and tender.
  5. Cook pasta

    Meanwhile, cook the low-carb pasta according to package instructions.

    For this step

    • 8 oz low-carb fusilli pasta
    Low carb rotini pasta being added to boiling water and cooked until tender.
  6. Make it creamy

    Return meat to the skillet and stir in Worcestershire sauce, sour cream, and beef broth. Let simmer over low heat for several minutes until mixture is thickened and steak is done to your liking. 

    For this step

    • 1 teaspoon Worcestershire sauce
    • 1 cup sour cream
    • 1/2 cup beef broth
    Beef and mushrooms simmering in a rich, creamy sour cream sauce for keto beef stroganoff.
  7. Add pasta

    Once pasta is ready, drain and add cooked pasta into the stroganoff. Stir to combine.

    Cooked low carb rotini pasta added to the creamy beef and mushroom stroganoff sauce.

Nutrition

Per serving: 1/6 of recipe

Calories
413
Fat
24.3g
Protein
37g
Total carbs
19g
Net carbs
8.5g

Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.

Frequently Asked Questions

What is the best cut of beef for beef stroganoff?

I like to use London broil or sirloin steak because both can be sliced into thin strips and cook quickly. Sirloin tends to be a little more tender, while London broil is often more budget-friendly. For either one, slice the beef thinly against the grain for the most tender result.

Can I use ground beef instead of steak?

Yes. You can substitute ground beef if that’s what you have on hand. Brown and drain it before adding the remaining ingredients. However, I prefer strips of steak because they give this stroganoff a more traditional texture and make the dish feel heartier than versions made with ground beef.

What can I serve with beef stroganoff instead of noodles?

You don’t have to use pasta at all. Try serving the beef and creamy mushroom sauce over cauliflower rice, fried zucchini, zucchini noodles or mashed cauliflower or turnips.

Why do you coat the beef in cornstarch?

The light coating helps the beef brown nicely and also helps thicken the stroganoff sauce. Since only 1 tablespoon is used throughout the entire recipe, the amount of cornstarch per serving is relatively small.

Can I leave out the cornstarch?

Yes. You can leave it out if you want to reduce the carbs further, but your sauce will be thinner. You could simply simmer the sauce a little longer to help it reduce and thicken naturally. You could also add in 1-2 oz of cream cheese to help thicken the sauce.

How do I keep the sour cream from curdling?

Keep the heat low once you add the sour cream and avoid letting the sauce come to a hard boil. Gentle heat will keep the sauce creamy and smooth.

Can you have beef stroganoff on keto?

Yes, when you skip the flour and regular pasta. My keto beef stroganoff uses a sour cream and beef broth sauce with low carb pasta, and it comes in at 8.5 g net carbs per serving. I lower it further by serving the beef over cauliflower rice instead of noodles.

What can I substitute for heavy cream in beef stroganoff?

I do not use heavy cream in this recipe at all. The creamy sauce comes from 1 cup of sour cream and 1/2 cup of beef broth. If you want it even richer or thicker, stir in 1-2 oz of cream cheese along with the sour cream.

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