Oh man... We're chilling on the carbs and taters are a rare treat. A few hacks I've picked up. One was said already, horseradish. Boosts the earthy tater flavor. It works better than you think. I also like a little cheese and gouda is my go to for mashed. Just enough to add a little oomph but you cannot tell cheese was added. I prefer white over black pepper in my spuds with bonus points for looking better. From here, I will share the common pro hacks I got from a cousin and friend both trained pro chefs. Butter (but WAY more than you think) Like stick per pound, yep. Then from here, egg (which needs to be tempered).