In a blender or food processor, combine the cilantro, olive oil, and salt and process until smooth.
Cut the chicken meat off the bones. Reserve all the bones and the meat from half a breast for another use. Slice the bread in half lengthwise and drizzle each half with the cilantro oil. Layer the sliced tomatoes, chicken meat, and grilled vegetables on the bottom half of the bread. Top with the second half and cut the sandwich into 4 pieces. Serve with potato chips.