Peel and chop the potatoes into even pieces.

Boil the potatoes in salted water until tender, about 15-20 minutes.

Drain the potatoes and return them to the pot over low heat to evaporate any excess moisture.

Mash the drained potatoes until smooth, then mix in the butter and milk or cream.

Fold in the chopped kale or cabbage and green onions.

Season with salt and pepper, adjusting to taste before serving.