Preheat oven to 375 degrees.
While the oven is preheating, add oil to a skillet over medium heat.
Add in diced jalapeno and small onion. Allow to cook for about 5-7 minutes, until the veggies have softened.
To a medium sized bowl, add shredded chicken, sauteed jalapeno and onion, can of diced tomatoes, cooked rice, corn, black beans, half the cheese, and spices. Stir to combine.
Cut and place your halved poblano peppers in cut side up. Spoon filling into each pepper. You may have extra filling, depending on the size of your peppers. I just pour the rest over the top!
Top with shredded cheese and bake for 30-40 minutes, until peppers are tender.