C'mon, everyone knows my butt is big.
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No, just have a large party. I use the basics of my mother's recipe, but kale, leaks, potatos and butter. Like, a whole cow's worth of butter.
We start with whole potatoes, remove a portion of the skin but leave some behind. Boil, and then mash down. Then thin sliced leaks, sauteed. A little salt and pepper in them. Add fresh kale and wilt. Add the whole pan's worth of veg to the potatoes, along with some butter (not a lot), mix to integrate.
Next part is important - serve really hot, but leave the back of a spoon indentation in the colcannon. Add butter, top with more colcannon.
Dig in with a your spoon or fork and watch the butter cascade out. Mix in, and enjoy with a bit more salt and pepper to taste.