Green Mashed Potatoes (no solanine)

Colcannon, or Irish mashed potatoes, have recently become my new favorite comfort food. Now that fresh greens like spinach, parsley, arugula, kale, collards green garlic and tarragon are waking up, I’ve been adding minced or chopped greens to salt-water-boiled gold potato chunks, then mashing everything with warm milk or sour cream, and finishing with a pat of butter. Amazing!
This is probably not the “authentic” way to make Colcannon. What is the “real” Irish way to make Colcannon? How are permies making their own versions of green mashed potatoes with the bounty available in your kitchen, field, and forest gardens?

I've never heard of this. I however think I need to get some russets in the oven right this minute to experience it...