Sweet Potato Soufflé

6 cups (about 2-29 oz cans) sweet potatoes (or yams) mashed
1 1/2 cup white sugar
1 cup melted butter
5 eggs
1 tsp. vanilla (I always put 2 tsp b/c I love vanilla)
1 cup evaporated milk

Mix all of the above ingredients until almost smooth and pour into 9x13 casserole dish. Put topping (recipe follows) on top (I usually make it look like a cobblestone road so it is evenly distributed) Bake @ 350 for 35-45 minutes.

Topping
1 cup flour
1 tsp. baking powder
1 cup brown sugar
2/3 cup melted butter
pinch of salt