I can’t share a mashed potatoes recipe without mentioning my husband Jack. He LOVES homemade mashed potatoes, specifically ones that are rich, creamy, and flavorful. I’ve made plenty that he’s liked in the past (see these garlic mashed potatoes and these Instant Pot mashed potatoes). But last year, I finally made the potatoes he’d been waiting for: ones loaded up with butter, milk, and sour cream. I’m not kidding when I say that these are the best mashed potatoes I’ve tried. They’re ultra-rich and blissfully creamy, and the sour cream gives them a delicious tangy kick. They’re easy to make…