1. Preheat oven to 350 degrees F (175 degrees C).
2. Stir cream cheese, milk, butter, and garlic salt together in a saucepan over low heat. Cook, stirring frequently, until the cheese has melted completely and the sauce is smooth, about 5 minutes. Stir corn, green chiles and jalapeno peppers into the sauce.
3. Bake in preheated oven for 30 minutes.