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Preheat oven to 375 degrees F.
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Prepare muffin tin. This makes 6 large or 12 small muffins. (Greased, muffin papers, or lined with parchment paper.).
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Wash and drain the blueberries. Sprinkle with 1/4 cup of the whole wheat flour and gently mix to make sure each berry is coated with flour. Set aside.
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Sift together remaining flour (1 cup), baking powder, salt, and cinnamon.
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Mix oats into dry ingredients.
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Cream the butter and sugar. Mix in egg.
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Add the milk and dry ingredients to the sugar mixture. Stir just to combine. Do not over mix.
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Gently fold in the blueberries.
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Spoon into prepared muffin tin. Fill nearly full.
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Bake 15 to 20 minutes. (Test center with toothpick. Toothpick should come out clean.).