Line a 9×13 inch baking dish with parchment paper. In a large bowl, combine the corn flakes, chia seeds (if using), and 1 cup peanut butter.In a pot, combine the honey, maple syrup, and vanilla. Bring to a boil over medium heat. Cook 2 minutes, then remove from the heat and pour the mix into the corn flake/peanut butter bowl and stir well. Spread the mixture out onto the prepared pan, packing it in tightly. Place in the fridge for 15 minutes. Meanwhile, melt together the chocolate and 1/4 cup peanut butter in the microwave. Spread the chocolate over the corn flake mix. Return to the fridge to set, about 15 minutes, then slice. The chocolate will not be totally set, but slicing is easier this way. Keep in the fridge.