Mix the above ingredients well. Pour into a buttered baking dish. (Can be made ahead and refridgerated at this point)
Just before baking top with the following the last 4 ingredients.
Blend ingredients by handusing a pastry blender or fork until a coarse, crumb-like mixture. Sprinkly on top of the sweet potato mixture. Bake uncovered at 350-375 for 45 minutes until puffed slighly in center.
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