Prick each potato several times. Bake 45 minutes or until tender.
Meanwhile, cook meat until no longer pink; drain. Combine with seasoning mix as directed on package.
Cut slits in tops of potatoes; top with meat mixture and remaining ingredients.
Place on oven rack. Bake the potatoes for 1 hour or until tender; cool.
When potatoes cool enough to touch, cut lengthwise in half. Scoop out inside of potatoes and put in bowl. Set potato skins aside.
Increase oven to 400°. Mash potatoes in bowl, add milk, butter, salt, pepper and cheese. Put mashed potatoes back into potato skins. Put on cookie sheet and bake another 20 minutes.