Add a thin layer of vegan red pepper pesto to both sides of the sourdough bread. Then add half of the mozzarella, the cooked chicken, tomato, arugula, the remaining mozzarella, and the other side of the sourdough.
Fire up your panini grill or set a nonstick skillet on medium-high heat. Once hot, lightly spray one side of the bread with olive oil and add it to the panini.
Pro-tip: if you’re inclined to add butter to the outside to get it crispy and buttery, try olive oil mayo instead! Fewer calories and the same buttery texture and flavor!
Cook until the outside of the sandwich is golden brown and crispy, about 6 – 8 minutes.
Enjoy immediately while hot!