Preheat the oven to 375℉.
Place the chicken on a cutting board. Add a piece of parchment paper or plastic wrap on top of the breasts and use a meat mallet or the bottom of a heavy skillet to pound them to about a 1/2-inch thickness. Pat dry with paper towels.
Season both sides of the chicken with 1 teaspoon salt, 1/2 teaspoon black pepper, and chili powder.
Add the cassava flour to a large plate. Dredge each chicken breast in cassava flour on both sides and shake off the excess.
In a large, oven-safe skillet (preferably cast iron), heat the oil over medium-high heat. Add the chicken breasts and cook for about 2 minutes per side until browned. This chicken will finish cooking through in the oven. Set aside.
Reduce the heat to medium. Add the poblano peppers, red onions, and garlic. Sauté for 3 minutes until the veggies begin to soften.
Add the corn, remaining 1 teaspoon salt, and 1/2 teaspoon pepper. Sauté for about 2 minutes. Reduce the heat to medium low.
Add the cream cheese, chicken broth, lime zest, and lime juice. Stir until the cream cheese is well incorporated, then remove from heat.
Nestle the chicken back into the skillet. Cover with the cheese. Transfer to the oven and bake, uncovered, for 12 to 15 minutes until the cheese is melted and chicken is cooked through.
Remove from the oven and garnish with cilantro. Serve with lime wedges.