This easy recipe for Vegetable Beef Guinness Casserole Topped with Champ features a hearty and rich stew-like filling with a buttery mashed potato topping. It’s perfect for St. Paddy’s Day or any day you want real-food comfort food, and the leftovers are even better!

Right now you’re probably wondering what the heck Champ is.

Champ, my friends, is an Irish thing! Basically, it’s mashed potatoes with scallion and loads of butter. (Because we all know potatoes and butter go together like white on rice. Or, well, like potatoes and butter.)…