Peel and cut the potatoes in half to reduce cooking time. Boil them until soft.

Melt 1/2 tbsp butter in a pot and sauté the chopped onion until translucent.

Add the boiled potatoes to the pot.

Pour in 2 cups of milk and blend the mixture using a hand blender or a regular blender.

Simmer the blended soup on low heat, stirring occasionally.

Adjust the consistency by adding more milk if needed.