Preheat oven to 350º. Spray a baking dish with cooking spray.
Heat the milk and chicken stock in a microwave safe bowl for a minute.
In a saucepan, melt 2 tablespoons butter over medium heat. Add flour and whisk for about 2 minutes. Gradually add warmed milk and chicken stock, whisking constantly until it has thickened.
Add seasonings and cook an additional minute. Set aside
In a large bowl combine cream cheese, cottage cheese and sour cream. Add warm soup mixture stirring to combine. Add shredded chicken and pour into a casserole dish.
In a small bowl or measuring cup add crushed crackers and 4 tablespoons melted butter. Combine with a fork and sprinkle over the top of the casserole.
Bake for 30 minutes until it is bubbly around the edges.
