Preheat your oven to 350 degrees
Place the halved poblanos on a baking sheet, drizzle with a neutral oil and bake on a 350 degree oven until slightly tender (10-14 minutes) and then removed from the oven, but keep the oven set to 350 degrees
Place a small skillet over medium heat and sauté the diced yellow onion until soft and translucent
Add 2 cloves of finely minced garlic and cook for 60 seconds and then transfer the garlic and onions off of the heat
In a large bowl, combine 1/2 cup of drained sweet corn with 1/2 cup of rinsed black beans, the sautéd onions and garlic, 4 ounces of diced green chiles, 2 cups of shredded barbacoa, 1/4 cup of shredded mozzarella, 1/4 cup of shredded sharp cheddar and 1/4 cup of finely chopped fresh cilantro
Fill each half of poblano with the mixture and top with the remaining shredded mozzarella and sharp cheddar
Return to a 350 degree oven until the filling is hot and the cheese has melted