Shepherd's Pie

This isn't the traditional Shepherd's Pie with lamb, but a quick and easy version my family loves.

Servings per recipe: 8
Calories per serving: 336
Preparation time: 25m
Total cooking time: 1h 10m

1 Preheat oven to 350 degrees F (175 degrees C). Coat a 9x13 baking dish with cooking spray.
2 Bring a large pot of salted water to a boil. Cook potatoes in boiling water until tender, about 15 minutes. Drain, reserving some of the cooking liquid. Mash potatoes with a little of the cooking liquid. Set aside.
3 In a large skillet, cook ground beef until brown over medium-high heat. Drain fat from pan. Stir in mushrooms, mixed vegetables, mushroom soup, celery soup, and salt and pepper; heat through. Pour into prepared baking dish, cover with mashed potatoes, and dot with butter.
4 Bake in preheated oven for 30 minutes, or until potatoes are golden and beef and vegetable mixture is hot and bubbly.