Start by carefully slicing a pocket into each chicken breast. Make sure not to cut all the way through. Pat the chicken dry so the coating sticks better.
In a bowl, mix softened cream cheese, shredded cheddar, and diced jalapeños. This spicy, cheesy mixture will make the inside of your chicken irresistibly creamy.
Spoon the cheese mixture into each chicken breast pocket. Press gently to seal, then dip each piece into the beaten egg and dredge in flour for a crisp exterior.
Heat a skillet with a bit of butter and sauté corn with green onions, chili powder, and cayenne until tender. Remove from heat and stir in mayonnaise and cotija cheese for a creamy, slightly sweet side.
In the same skillet, add butter and sear stuffed chicken until golden brown on both sides. This step locks in the juices and gives a delicious crust.
Top chicken with extra cheddar and sliced jalapeños. Transfer to the oven and broil for 1-2 minutes until cheese is melted and slightly crisp. Serve hot with creamed corn and garnish with fresh cilantro.