Cooking the Aromatics: Heat the oil in a pan over medium heat and sauté the onion for 5 minutes, until tender.
Preparing the Sauce: Meanwhile, in a small bowl, mix the tomato paste, honey, apple cider vinegar, Worcestershire sauce, and spices.
Assembling the Filling: Add the corn and chicken to the pan, season generously, and heat for a few minutes. Stir in the sauce, ensuring all ingredients are well coated, then remove from heat. Add the cheeses and mix lightly until they begin to melt.
Building the Sandwiches: Place 4 slices of bread on a work surface and evenly distribute the chicken mixture. Top with the remaining slices of bread.
Panini Cooking: Preheat the panini oven to 350°F (180°C). Place the sandwiches inside, close, and cook for 5 minutes, until the bread is golden brown.
Serving: Remove from the oven, cut in half, and serve immediately.
