This is so easy to make, and even though there aren't many ingredients, very flavorful. Vary the amounts according to your tastes.
Lean, very thin cuts of steak
Ciabatta bread, freshly baked or toasted
Seasonings, to taste
Halve the bread lengthwise, butter, and toast to desired doneness.
Spray both sides of the steak with olive oil, and season to taste (I used McCormick steak seasoning). Cook in a pan until just browned, 2-3 minutes per side. Let sit for a couple minutes.
Put the steak on the ciabatta, and add the cheese.