Shape your sliders so they are just slightly bigger than your slider buns. Press your thumb into the middle of the burger just enough to indent it slightly.
Sprinkle with salt and pepper.
Pop your plank on the grill for a few minutes. It's going to get a big of a curl to it. So don't put the food on it yet. Once it gets a slight bend carefully turn it over with tongs. Now you can add your burgers to the plank.
Pop the top of the grill down and allow them to cook for about 7 to 10 minutes for medium well.
Lift the lid, turn the burgers over with tongs, and put the lid back down for about 4 to 7 minutes.
Lift the lid and add the cheese. I used one slice of cheese per burger. I'm nuts for cheesy burgers.
Pop the lid down and allow them to cook just till the cheese melts, about 2 minutes.
Top with roasted red peppers and caramelized onions.
Carefully remove the burgers from the plank.
Slide on the toasted buns.
Serve with a big old cheesy smile!