Step 1: Prepare the Dough - In a mixing bowl, combine the pre-cooked white cornmeal, warm water, and salt. Stir until there are no lumps. Let the mixture sit for about 5 minutes to hydrate the cornmeal.
Step 2: Form the Arepas - Once the dough has set, knead it gently until smooth. Divide the dough into 8 equal portions and roll each into a ball. Flatten each ball into a patty about ½ inch thick.
Step 3: Cook the Arepas - Heat a skillet or griddle over medium heat and add a small amount of vegetable oil. Cook the arepas for about 5-7 minutes on each side, or until they develop a golden-brown crust.
Step 4: Prepare the Filling - While the arepas are cooking, combine the shredded chicken, avocado, mayonnaise, chopped onion, cilantro, jalapeño (if using), lime juice, salt, and pepper in a bowl. Mix well to combine all the flavors.
Step 5: Assemble and Serve - Once the arepas are cooked, slice them open and fill them generously with the chicken mixture. Serve warm and enjoy your homemade arepas!