1 (2 ounce) package dry onion soup mix
1 (8 ounce) package cream cheese, softened
1 cup milk
1 egg
1/2 teaspoon salt
1 cup shredded Cheddar cheese
1 cup shredded mozzarella cheese
1 cup shredded Cheddar cheese blend
Preheat oven to 400 degrees F (200 degrees C).
In a medium bowl, mix together soup mix, cream cheese and milk. Spoon into 9x13 inch baking dish, and sprinkle Cheddar cheese and mozzarella cheese on top.
Fill the dish with Cheddar cheese, and top with Cheddar cheese. Bake in the preheated oven for 35 minutes, or until cheese is melted and lightly browned.