Preheat oven to 350 degrees.

Using a stand mixer or electric handheld mixer, beat the butter and sugar until fluff. Beat in the egg, vanilla and molasses until combined.

In a separate bowl, whisk the oats, flour, baking powder, cardamom and salt.

With the mixer running, slowly add the dry ingredients into the wet ingredients. Fold in the butterscotch chips.

Drop the batter in tablespoons onto a parchment-lined baking sheet. Bake 14-16 minutes. Cookies will still be soft, but they will continue to bake on the sheet once they are removed from the oven. Sprinkle with flaky sea salt.