Heat olive oil in a large skillet over medium-high heat.
Season beef with salt, pepper, paprika, and garlic powder.
Sear beef in batches until browned on all sides. Remove and set aside.
In the same skillet, melt butter and add mushrooms. Cook until golden.
Add garlic and cook for 30 seconds until fragrant.
Pour in beef broth, scraping up browned bits from the pan.
Stir in heavy cream, Dijon mustard, thyme, and red pepper flakes.
Return beef to the skillet and simmer 10–12 minutes, until sauce thickens and beef is tender.
Garnish with fresh parsley and serve hot.
