I got this recipe from my wife’s grandmother’s pastor’s wife. Only made a couple of minor tweaks based on experience.
3 Cups cooked mashed sweet potato
3/4 cups of brown sugar
1/2 cup of melted butter
2 eggs well beaten
1 tsp vanilla extract
1/3 cup milk
1/2 teaspoon salt
Mix and blend the above ingredients and pour into an 8″ square pan, which should be first greased with crisco.
Topping is 1/3 cup flour, 1/3 cup brown sugar, 1/4 cup of melted butter, 1 cup of chopped nuts. Mix it together and gently place layer on top, enough to hide all of the sweet potatoes.
bake for 350 degrees for 30 minutes. Will require a little time to set (10 minutes or so) after it comes out of the oven.