Bake for 12–15 minutes or until bubbling and golden brown. You can save a little time by grilling the cheesy leeks instead of baking, if you like. Warm the baking dish before adding the leeks ...
In the crockpot (use a liner if you can) add the mixture and remaining ingredients. Cook until bubbly and all the cheese is melted. You can easily double this recipe and it freezes well.