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Preheat oven to 350°F.
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Grease or paper line 20 muffin cups.
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Spread walnuts on a baking sheet, toast in the oven 5 minutes, cool and coarsely chop.
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In a bowl, sift together flour, baking powder, baking soda and salt.
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In a larger bowl, combine sugars, syrup and butter, beat with an electric mixer until light and fluffy.
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Add the eggs one at a time, beating to mix thoroughly after each addition.
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Pour half of the buttermilk and half of the flour mixture into the butter mixture and stir until blended, repeat with the remaining ingredients.
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Fold in the walnuts and fill muffin cups 2/3 full.
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Bake 20 to 25 minutes, remove and let stand 5 minutes before transferring to a cooling rack.