Preheat the grill or a grill pan on medium heat.
Generously season both sides of the steak with the steak seasoning and salt and pepper.
Lay down the spring mix, top with tomatoes, cucumber, onion, and blue cheese.
Grill the steaks on both sides to your desired temperature using a thermometer. (see below) Once cooked set on a cutting board to rest for 3 minutes.
Turn up the heat to high.
Grill the peaches wedges on each side. Approximately 1 - 2 minutes per side until they have grill marks.
In the meantime, whisk all of the ingredients for the dressing in a bowl. Season with salt and pepper to taste.
Thinly slice the steak across the grain and serve it over the salad with the grilled peaches.
Dress the salad before serving with crusty bread on the side.