Grab your softened butter and make sure your confectioners' sugar is nicely sifted before diving into this classic American buttercream. Give them plenty of time in the mixer so the frosting turns delightfully light and fluffy, then drizzle in the milk bit by bit until you hit that sweet spot for piping or spreading.
Don't worry if it seems a little gritty at first - just let the mixer keep running to let that sugar really blend in before you reach for more liquid. Keep it on the firmer side if you're aiming for crisp piped edges, or splash in a touch more milk when you want easy, swooping swirls on cupcakes. The brand and grind of your sugar make a real difference here, so stick with a finely milled confectioners' sugar.

