Heat a nonstick skillet over medium high heat. Add the olive oil, then all the veggies. Let the veggies sit long enough without being touched that they begin to char, this should only take about 30 seconds at med-high. Then stir and let sit again. Do this for 4-5 minutes until there are little char spots all over veggies. You are charring (not burning, there is a difference) to get that "grill" effect of Philly veggies. Transfer veggies to a small bowl and set aside.