In a sauté pan brown the ground beef.Reduce heat to a simmer then add onion mix and two Tablespoons water, mix well.
Add the cheese, stir until incorporated.
Cut the top off each potato on the long side.Scoop out the interior potato.
Divide burger mixture into each of the potatoes.
Mix the remaining potatoes with the sour cream and butter.Salt and pepper to taste.
In a piping bag pipe the remaining potato mixture onto each of the potatoes.
Hack: If you don’t have a piping bag, you can cut the corner off a large plastic bag or ziplock. Fill it like a pastry bag.It won’t have the decorative ridges but it will work. OR simply dollop the potatoes onto the meat filling with a spoon.
Place the potatoes, on a baking sheet, into the oven to broil until the tops are golden brown.