Season the medallions with salt and pepper on all sides.
In a very hot skillet, put the oil and add the medallions. Leave for 2 minutes.
Add the garlic cloves, turn the meat over and leave for another 2 minutes. Meanwhile put the butter giving a "bath" in the medallions.
Flambé with the cognac.
Turn off the fire. Remove the medallions from the skillet and let rest for 5 minutes.
Add the mascarpone to the skillet with the heat off and stir until it dissolves completely, forming a sauce.
Return the meat over the sauce (turn on the fire and leave it for 1 min just to warm up)
Finish with fresh thyme on top.
TIPS:
🔸 the meat needs to be at room temperature and should only be seasoned when it goes to the skillet.
🔸 Medallions must be 2 fingers high.
🔸 this 2 min time is for the medallions to the point (very pink inside), if you prefer well done leave 3 to 4 min on each side.
🔸 you can replace mascarpone with milk cream or cream cheese.
🔸use an oil flavored with herbs (this one has thyme and rosemary)