Spray a 2 qt. casserole (or pie/baking pan) with nonstick spray.
In a pan, saute a few sliced carrots and a couple stalks grated celery in 1 T butter, until sofftened.
Brown 1-1/2 - 2# ground beef with 1 diced onion (if you like mushrooms, add sliced mushrooms too). Simmer until the meat is fully cooked & the vegetables are soft. Remove from heat and drain off excess beef. Add the carrots/celery (& any other vegetables; peas, corn....) at this point.
Add 1-1/2 cup water, 4 T. tomato paste, 2 T. Worcestershire sauce, salt and plenty of pepper, a few shakes of garlic powder and simmer for a half hour.
While the meat is simmering, boil 4 large potatoes until done. Drain. Add 2 Tblsp. butter, 1/2 cup shredded cheddar (or co-jack) cheese, 1 Tblsp. parsley, salt & pepper and 1/4 cup heavy cream (or milk). Mash together thoroughly.
Heat the oven to 375ยบ.
Spoon the cooked meat into the prepared casserole/pan and top with the mashed potatoes. Lightly sprinkle paprika over the top.
Place the 'pie' in the oven and bake for 30-40 minutes, or until the top is golden. Remove & serve.
