This one looks very similar to Pumba's recipe. It's from my cousin's grandmother on her other side. It is the only way anyone in the family will eat sweet potatoes...
Mammy Stinson's Sweet Potato Casserole
5 cups mashed sweet potatoes (you can use canned)
1-cup sugar
½ cup milk
½ stick butter
1-teaspoon vanilla
½ cup coconut (the flaky, sweetened kind from a package)
Combine all ingredients together. Put in casserole dish. Mix the following together and place on top of sweet potato mixture: ¾ cup brown sugar, ½ stick butter softened, ½ cup self-rising flour, 1 cup pecans, chopped. Bake 15-20 minutes at 350 degrees.