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Preheat oven to 375°F and line a muffin pan with baking cups.
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In a measuring cup, pour 3/4 Milk and add almost a full tablespoon of white vinegar, stir and set aside for several minutes.
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In a small bowl, lightly beat 1 Egg and stir in the Oil. Add sugar, vanilla and mix well. This is your 'wet mix'.
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In a large mixing bowl, sift in flours, baking powder, baking soda and salt, stir. This is the 'dry mix'.
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Add the frozen berries to the dry mix.
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Blend the milk mixture with the wet mix.
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Slowly pour the wet mixture over the dry while stirring lightly with a spoon. Do NOT over mix. They key here is to stir it just enough to moisten the dry mix. You should have very thick, sticky, lumpy batter.
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Stuff all the batter into 12 cups - they will overflow a bit, this is not for mini muffin pans!
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Bake for 20-23 minutes in a 375° oven.