Place Hatch chiles directly on the grates of a gas stove. Cook over medium heat, flipping with tongs occasionally, until blackened and charred, about 5 minutes. Place in a sealed plastic bag and allow to cool, 7 to 8 minutes. Peel off charred skins, remove seeds, and cut flesh into 1-inch squares.
Melt butter in a pan and saute onion until translucent, about 5 minutes. Stir in corn. Add chiles and sprinkle with chicken bouillon granules and pepper. Stir until well combined. Add chicken and crema; simmer until heated through, about 5 minutes.
