Reuben Baked Potatoes

2 tablespoons vegetable oil 1 medium onion , finely chopped 1 garlic clove , minced 1 cup chopped corned beef 2 large potatoes , washed and dried 1/4 cup milk[...]

4 large baking potatoes 2 cups finely diced cooked corned beef 1 (14 ounce) can sauerkraut , rinsed, well drained and finely chopped 1/2 cup shredded swiss[...]