Prepare the Old El Paso Spanish Rice according to the package instructions. While it's simmering, preheat the oven to 450 degrees F. Place 8 poblano peppers on a rimmed baking sheet and roast in the oven for 15-20 minutes until the skin is bubbly. Carefully peel the loose waxy skin off as much of the peppers as possible and discard.
Gently cut a long slit in the top of each roasted poblano. Use the tip of the knife to sever the seeds from the top of the pepper then remove the seeds. Scoop an even portion of cooked rice into each pepper, pressing lightly to fill out the bottom of the peppers.
In a medium bowl, mix the shredded chicken with the cayenne pepper sauce. Toss to coat, then mix in the shredded cheese. Spoon the chicken mixture evenly into each pepper. Bake for 10 minutes, until bubbly and golden.
While the peppers are baking, whisk the blue cheese dressing with half a packet of Old El Paso taco seasoning. Once the stuffed poblano peppers come out of the oven, drizzle the tops with the zesty blue cheese dressing and sprinkle with chopped green onions. Serve warm.