Microwave for 7-8 minutes, flipping once. You want them to be fully cooked and tender. Exact cooking time will depend on the size of your spud.
Allow the potatoes to cool for a moment. Slice in half and scoop out the center of the potato and put it in a small bowl. Set the "shells" aside.
Mix half the cheddar cheese, Greek yogurt, cream cheese and half of the onions together. Add a splash or two of milk to get a smooth consistency. Add salt and pepper to taste.
Pile the potato mixture back into the shells. Place on a baking sheet and top with the rest of the cheddar cheese.
Bake for 10 minutes or until the cheese is bubbly.
Before serving sprinkle with the rest of the green onions