Shepherd's Pie with Cheesy Mashed Potatoes

"I don't always toot my own horn, but when I do, it's over this shepherd's pie that I've spiced up with fresh herbs and spices. But if that wasn't enough, I took all the Irish cheddar I could find and loaded it up to make the cheesiest mashed potatoes and my gosh, this meal is sure to be a hit if you're sitting in a frozen tundra and need defrosting!"