Coffee Rubbed Rib Steak

1 - 1 1/2 lbs boneless steak
2 T ground espresso beans
1 1/2 T light brown sugar
1/2 t ground chipotle or ancho chile pepper
1 T paprika
1 1/2 t garlic powder
1/2 t whole mustard seed
1/4 t red pepper flakes
Salt & Pepper
Canola or Olive oil

To make rub, combine ground espresso beans, brown sugar, chili powder, paprika, garlic powder, mustard seeds, pepper flakes, 1 1/2 t salt and 1 t pepper.  Set aside.  Preheat oven to 425. Brush steaks lightly all over with oil.  Season steaks all over with salt & pepper. Rub 1 T of coffee rub on top of each steak and allow to stand at room temperature 10 minutes.  Heat dry cast iron skillet large enough to hold steaks over medium high heat for 5 minutes or until very hot.  Add steaks, rub side down and cook without moving for 3 minutes, until the bottom of the steaks are a deep brown color.  Flip steaks over and cook 2 more minutes. Transfer pan with steaks to hot oven and cook 5 minutes for medium-rare.  Remove steaks from skillet to plate, cover with aluminum foil and allow to rest 10 minutes.  Slice and serve warm.