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Let the meats temperature get to room temperature about half an hour before preparing. PAT the beef dry using paper kitchen towels and season them with pepper and salt.
HEAT olive oil in a large skillet and cook the bavettes beautiful brown in about 3 minutes per side. The exact time depends on the thickness of the beef and the way you like your steak best.
WRAP the beef in tin foil and let it rest for about 10 minutes. Meanwhile CREATE an easy mustard sauce by adding a knob of butter to the large skillet. STIR in the mustard and crème fraîche and SEASON the sauce with pepper and salt.