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Preheat oven to 325 and line a baking pan with aluminum foil. Spread the oatmeal on the pan and sprinkle with the cinnamon. Bake for 5 minutes. Set aside to cool. Turn the oven up to 350.
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Combine the banana, eggs, yogurt, baking powder and honey in a bowl and mix on low with an electric mixer.
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Add the cooled oatmeal to a blender and pulse until it is smooth. Stir the oatmeal into the liquid ingredients.
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Stir in the chopped plums. Spoon the mixture into a muffin tin. Bake for 25 minutes. Enjoy!