All of the traditional Shepard's Pie flavors with short cut ingredients and made in one skillet.
Preheat oven to 375 degrees. In a 12" nonstick skillet, cook beef and onion over medium-high heat, stirring occasionally, until meat is cooked through, drain. Add minced garlic to the drained meat and cook for an additional 30 seconds.
Reduce heat to medium, add frozen vegetables, tomato paste, worcestershire sauce and Montreal steak seasoning. Cook 4-5 minutes, stirring frequently. Meanwhile, in a small bowl, mix gravy packet and water with a whisk until well blended. Pour over the meat and vegetable mixture and cook for an additional 2-3 minutes or until it begins to thicken.
Remove from heat and spread refrigerated mashed potatoes over the beef mixture. Top with cheese and bake for 20- 25 minutes or until heated through.