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1 To make the filling, place the chicken breasts and onion in a medium saucepan and add enough cold water to cover by 1 inch. Add 1/2 teaspoon salt and 1/4 teaspoon pepper and bring to a simmer over medium heat. Reduce the heat to medium-low and simmer, uncovered, until the chicken is cooked through, about 15 minutes. Remove the chicken from the saucepan and let cool completely. Tear the chicken into shreds.
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2 Mash the avocado, mayonnaise, and vinegar together in a medium bowl with an immersion blender or large fork until smooth. Stir in the cilantro, parsley, jalapeno, and garlic. Add the chicken, red pepper, red onion, and scallion and mix together. Season with salt and pepper. Taste and add more vinegar to give the filling a pleasant, but not sour, tang. Cover and refrigerate until ready to serve.
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3 To make the arepas, stir 3 cups lukewarm water and the salt together in a large bowl to dissolve the salt. Gradually add 3 cups cornmeal, mixing with your fingers to dissolve any lumps, adding enough to make a soft dough that holds its shape without cracking when molded. Set dough aside to rest for 3 minutes. Add the oil and work it in with your hands, adding cornmeal or water to return the dough to the proper consistency.
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4 Divide the dough into 6 equal portions. Shape each into a 4-inch diameter disk, about 1 inch thick. Transfer to a baking sheet.
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5 Position a rack in the center of the oven and preheat the oven to 350u00b0F. Lightly oil a large nonstick skillet or griddle and heat over medium heat.
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6 In batches, place the arepas in the skillet. Cook until the underside is a splotchy golden brown, about 4 minutes. Turn and brown the other side. Return arepas to the baking sheet.
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7 When all of the arepas are browned, transfer them directly to the oven rack (without the baking sheet). Bake until the surfaces of the arepas have formed a taut skin-if you rap your fingers on one, it will feel and sound like a drum. Return arepas to the baking sheet and let cool slightly. Split each arepa in half and fill with the chicken mixture. Serve warm.
