In a large pot, bring some water to a boil, enough that you will cover the potatoes in water.

In the meantime, wash and peel potatoes.

Cut the potatoes in similar sizes to allow uniform cooking.

Once the water is boiling, add the potatoes and cover with a lid. Cook for 20 minutes or until the potatoes are very tender. 

Wash the kale, remove the center stem, and using a sharp knife, chop it into small pieces.

Once the potatoes are cooked, strain the water and put them back in the pot. Using a potato masher, mash them.

Gradually add the milk, cream, and butter. Keep mashing until all is well incorporated and smooth.

In a pan over medium heat, melt 1 tablespoon butter and cook the kale for 2 minutes until slightly wilted. 

Add the kale to the mashed potatoes and stir until well combined. Top with some chopped green onions and serve while hot.