Place one slice of bread on a plate, layer ⅓ of the cheese, then steak, another ⅓ of the cheese, then avocado slices, the rest of the cheese, sprinkle on salt and pepper if desired, place second slice of bread on top.
Heat a ridged cast iron grill on medium, spray w/ cooking spray or olive oil in a Misto can, gently move the sandwich to the pan and then place on top of the sandwich another pan, the heaviest one you've got, this will squish down the sandwich without needing a fancy Panini maker. After a couple of minutes flip sandwich and put the heavy pan on top again. Remove from pan, slice in half and enjoy.
The avocado adds such a rich creaminess to this Steak, Avocado and Cheddar Healthy Panini Sandwich recipe you don’t need so much cheese, this would also be a great snack or dinner on a weeknight. If you don’t have steak get creative, left over chicken or ham will also work great here.