Growing up, shepherd’s pie was the ultimate cold-weather comfort food in my house. We all loved to dig into those warm, hearty layers of meat, veggies and mashed potatoes that felt like a cozy hug.

The one dish that's perhaps more synonymous with St. Patrick's Day than corned beef and cabbage? Shepherd's Pie. And while most people think it's a super time-consuming, labor-intensive casserole to ...