Boil the potatoes until tender, drain and allow to cool.
Cut in half and use a teaspoon to create a bowl in each potato half. Reserve about 1/4 cup of the potato filling.
Mix the onion, cheese, sausage and potato together well. You can add salt and pepper to taste but most sausages are well seasoned and the cheddar has a lot of flavor.
Add a teaspoon of filling to each potato half. Place on a baking sheet and bake for about 10 minutes at 400F. Allow to cool and add a dollop of creme fraiche and a sprinkle of dill to each bite.