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Preheat oven to 400*F.
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Grease 12 standard-size muffin cups, or line with paper wrappers.
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In a medium bowl, using an electric mixer on medium speed, cream together the butter and sugar until smooth.
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Add the egg, milk, and vanilla; blend well.
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In a large bowl, combine the baking powder, 2 cups of the flour, and the white chocolate; whisk to combine.
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Gradually add to the butter mixture; stirring just until combined.
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Gently fold in the raspberries--the batter will be slightly lumpy.
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Fill the muffin cups 3/4 full of batter.
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In a small bowl, combine the 1 Tbsp. of flour and sugar; mix thoroughly.
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Dust muffin tops with the sugar mixture.
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Bake for 20-25 minutes, or until the center of a muffin springs back when lightly pressed.
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Cool for 5 minutes in the tins; carefully transfer muffins to wire racks and cool further.
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Serve warm or cool; store in an airtight container at room temperature.