Preheat oven to 375 degrees. Lightly grease 12 muffin cups or line with muffin papers.
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Prepare batter. Spoon into into muffin cups.
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Mix together brown sugar, flour and cinnamon. Cut in butter with a fork until mixture is coarse crumbs.
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Sprinkle crumb topping over muffin evenly.
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Bake for 18 to 20 minutes or until a toothpick inserted into center of a muffin comes out clean.
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Serve warm with butter, if desired.
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