Preheat the oven to 400℉.
First, mix the cream cheese and the butter together. Then, slowly beat in the milk until completely combined and smooth. Now, fold in the sugar, salt and pepper.
In the large bowl, add in the corn and the Rotel tomatoes. Then, pour the cream cheese mixture in. Add in the grated cheese and fold everything together until evenly combined. Add the contents into the baking dish.
Place in the oven and bake for 20-25 minutes until everything is heated through and there's a little browning on the edges.
Lastly, allow to cool before serving and enjoy.