Melt 1 tablespoon butter in a large skillet over medium heat. Add 1 medium onion and cook until soft and translucent, about 5 minutes. Stir in 2 garlic cloves and cook for another 30 seconds, just until fragrant.
Add 8 ounces mushrooms and sauté until they release their juices and begin to brown, about 5 minutes.
Push the mushrooms to one side of the pan and add 1 pound ground beef. Cook until browned and no longer pink, breaking it up with a wooden spoon as it cooks. Season with 1 teaspoon sea salt and ½ teaspoon black pepper.
Stir in 1 teaspoon Dijon mustard and 1 tablespoon Worcestershire sauce. Pour in ½ cup beef bone broth and stir to combine. Bring to a gentle simmer and cook for 8-10 minutes, stirring occasionally, until the sauce reduces slightly and thickens naturally from the beef and mushrooms.
Reduce the heat to low and stir in ½ cup sour cream and ¼ cup heavy cream. Warm gently - do not boil - until the sauce is smooth and creamy. Adjust salt and pepper to taste.
Serve over egg noodles, mashed potatoes, or buckwheat.
Notes
Storage: Store leftover stroganoff in an airtight container in the fridge for up to 3 days. To reheat, warm gently in a skillet over low heat while stirring to maintain a smooth sauce. Avoid boiling during reheating, as the cream can separate. Stroganoff can be frozen for up to 1 month in a freezer-safe container; thaw overnight in the fridge and reheat gently in a skillet.Helpful Tips:
Brown beef properly - let the beef cook undisturbed for a few minutes before stirring to get better browning and flavor.
Prevent cream curdling - always reduce heat to low before adding sour cream and heavy cream, and warm gently while stirring.
Avoid thin sauce - gently simmer for a few more minutes uncovered to reduce the sauce and thicken it.
The information shown above is an estimate provided for your convenience by an online calculator. It should not be considered as a substitute for a professional nutritionist's advice. Please see our complete Nutritional Information Disclaimer.