Sweet Potato Casserole

Here's what my sister brought to our Thanksgiving dinner. This recipe would NOT win any low-fat awards, but it was fantastic! :)

Ingredients:
3 cups cooked mashed yams
1/2 cup granulated sugar
2 beaten eggs
1 teaspoon vanilla
1/2 cup softened butter
1/3 cup flour
1/3 cup butter
1 cups brown sugar
1 cups pecans

Directions:
Combine first 5 ingredients. Stir well and pour into baking dish. Combine remaining ingredients and mix until crumbly. Spread evenly over yam mixture. Bake at 350 degrees for 30 minutes.