Ruth's Chris Sweet Potato Casserole

Crust:
3/4 cup brown sugar
1/4 cup flour
3/4 cup chopped nuts (pecans preferred)
1/4 cup melted butter 

Sweet Potatoes:
3/4 cup sugar
1/4 teaspoon salt
1/4 teaspoon vanilla
2 cups mashed sweet potatoes
1 egg, well beaten
1/4 cup butter 

Combine Crust Mixture in mixing bowl and put to one side. 

Combine Sweet Potato Mixture ingredients in a mixing bowl in the order listed. Combine thoroughly. 

Pour Sweet Potato Mixture into buttered baking dish. 

Sprinkle Crust Mixture evenly onto surface of Sweet Potato Mixture. 

Bake for 30 minutes at 350°. Allow to set for at least 30 minutes before serving.

from: Ruth's Chris