In a large skillet, heat the olive oil over medium-high heat. Add the sliced beef and sauté until browned on all sides. Remove the beef from the skillet and set aside.
In the same skillet, add the chopped onion and minced garlic. Sauté for about 2-3 minutes until the onion becomes translucent.
Add the sliced mushrooms to the skillet and cook for an additional 5 minutes until they are tender and have released their moisture.
Sprinkle the flour over the mushroom mixture and stir well, cooking for another minute to allow the flour to absorb moisture.
Gradually pour in the beef broth while stirring continuously, bringing the mixture to a simmer.
Once it thickens, stir in the Dijon mustard, paprika, salt, and pepper. Fold in the cooked beef.
Take the skillet off the heat and gently mix in the cottage cheese, stirring until well combined.
Serve the stroganoff over cooked egg noodles or rice, garnished with chopped fresh parsley.
Notes
Serve with egg noodles or rice and garnish with fresh parsley.