Preheat the oven to 175 ° C (top / bottom heat). In a large bowl, mix together the cream cheese, sour cream and chicken stock. Add the potatoes, smoked ham, 100 grams of the 225 grams of cheddar cheese and the peas.
Pour the mixture into a large greased casserole dish and sprinkle with the remaining cheddar cheese. Put the form in the oven and bake the casserole for 1 hour. The potatoes should be soft.