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1.Preheat oven to 400 degrees.
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2.Combine flour, sugar, baking powder and salt.
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3.In a separate bowl, mix egg, milk and oil (using a fork works well).
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4.Pour egg mixture into dry ingredients and mix just until combined.
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5.Mix blueberries with ½ tsp flour and then gently fold into the batter.
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6.Fill muffin cups 2/3 full.
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7.Prepare streusel: mix dry ingredients and then cut butter into mixture until it turns into crumbs.
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8.Sprinkle over muffins.
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9.Bake for 20-25 minutes or until tops spring back.