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Heat oven to 375
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In a mixing bowl mix dry ingredients together: flour, sugar and cinnamon. Make a well in the center and add wet ingredients: egg, sweet potatoes and butter. Mix until moistened.
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Fill muffin tins 2/3 full with batter - you'll want to grease them first if you don't use paper liners. Set aside.
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In a small bowl, mix butter, sugar, flour and cinnamon with a pastry blender until crumbly. Sprinkle crumb topping onto each muffin.
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Bake for 15-18 minutes or until toothpick inserted in center comes out clean.
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Cool before serving.
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Makes 21 muffins