Crockpot Tuesday- Shepherd's Pie

I recently acquired a copy of Angela Coffman's (of Grocery Shrink fame) Slow and Savory Suppers e-book. It looks like it's gonna be a great crockpot resource. I have only been able to try one recipe so far, but it was fabulous. :) Everyone in the family liked it. I am going to be trying at least one of these a week until I go through them all. Here's the recipe I tried (reposted with Angela's permission, of course)

Shepherd's Pie

2 carrots, peeled and diced

2 stalks celery, diced

1 onion, diced

2 cups frozen peas

2 tsp garlic powder

1 lb ground beef, browned

1 tbsp tomato paste

2 tbsp Worcestershire sauce

1/2 cup water

1 tsp salt

1/2 tsp black pepper

2-4 cups mashed potatoes

1/2 cup parmesan or sharp cheddar cheese

1.Combine all but potatoes and cheese in a greased slow cooker. ( I did not grease mine and it turned out fine.) 2. Spread mashed potatoes on top. 3. Sprinkle with cheese. 4. Cook on high 3-4 hours or low 6-8 hours.