In the bowl of a stand mixer fitted with the paddle attachment add in the cream cheese, sour cream and 1 1/2 cups cheese; mix until creamy and combined.
Next add in the corned beef, sauerkraut, mustards and caraway seed and mix just until combined.
Spread into a greased 1 1/2-2 quart baking dish.
Sprinkle remaining 1/2 cup cheese on top
Bake uncovered for 30 minutes, until hot and bubbly.