This potato-topped shepherd's pie gets extra flavor from the cheese and carrots that are added to the mashed potato crust. You can take a shortcut with the crust because the recipe calls for frozen mashed potatoes. There's a reason this comfort dish has remained a classic Southern staple. With its layers of beef, veggies, and mashed potatoes, it utilizes great flavors and gives off a warm, homey aroma that's enough to make everyone gather around the dinner table in no time! Everyone in the family will want seconds. This is the perfect make-ahead recipe because it can freeze for up to one month. That's 55 minutes well-spent.