Mennonite Orange Muffins
Ingredients:
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2 cups all-purpose flour
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2 teaspoons baking powder
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¼ teaspoon baking soda
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1 teaspoon salt
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½ cup white sugar
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1 tablespoon grated orange zest
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⅔ cup orange juice
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½ cup melted butter
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2 eggs
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½ cup ground walnuts
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1 tablespoon melted butter
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¼ cup packed brown sugar
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½ teaspoon ground cinnamon