For the T-bone steaks: Heat a large cast-iron griddle or skillet over medium-high heat. Generously sprinkle both sides of the steaks with salt and pepper.
Add the oil to the griddle. Add the steaks and cook until nicely browned, 3 to 4 minutes per side for medium-rare. Remove from the heat, then tent with foil and let rest for 5 minutes before slicing.
For the easy bearnaise sauce: Add the yolks and lemon juice to a blender. Turn on the blender and slowly stream in the melted butter. Once all the butter is incorporated, season with salt and pepper. Remove the sauce to a bowl over a bain marie (hot water) and keep warm. Add the chives, red onion and thyme and stir to combine. Taste and adjust the seasoning with a little more salt and pepper. Remove from the heat and add to a serving bowl.
Serve the bearnaise sauce over the steaks.
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