
Learn How To Make The Best Panini from Delish.com.
In a large cast iron skillet over medium heat, heat 2 tablespoons oil. Season chicken with oregano, red pepper flakes, salt and pepper. Add chicken to skillet and cook until golden and cooked through, 7 minutes per side. Remove from pan.
Build panini: Slice ciabatta rolls in half, then spread about ¼ of the pesto on bottom half of each roll. Top with tomato, chicken, and mozzarella. Spread remaining pesto on the top half of each roll.
Heat a grill pan with remaining 2 tablespoons oil and add one panini. Cook until bottom is golden and cheese is starting to melt, 5 minutes. Flip then place a heavy skillet on top of sandwich and press down to flatten panini. Cook until golden and cheese is completely melted, another 5 minutes. Repeat with remaining panini.