Macaroni and Beef Casserole

1 small package macaroni, cooked and drained
2 tablespoons oil
1 1/2 pounds ground beef, browned and drained
salt and pepper
1 large onion, chopped
2 stalks celery, chopped
1 can tomato paste (we used the 6 oz. size)
3/4 cup water
2 tablespoons sherry (we just used water)
1 can tomato soup
grated cheddar or Parmesan cheese
1 teaspoon leaf oregano

Toss cooked noodles in oil. Place in greased crock pot. Add all remaining ingredients, except cheese. Stir thoroughly. Sprinkle cheese over top. Cover and cook on low 4-8 hours or on high 2-3 hours. Makes 6 servings.

NOTES: We were low on groceries and short on time when I made this, so I changed a few things in the recipe. We didn't have celery, we used onion powder instead of a real onion, we only had 1 lb. of ground beef, and we added water in place of the sherry. We also cooked everything in a skillet, as seen in the photo. Despite the changes, it still turned out tasty. I found this recipe online somewhere a couple of years ago, but I don't remember where.