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Preheat oven to 400 degrees.
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Butter standard muffin tins.
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In a small bowl, stir and toss the flour, baking powder, baking soda, and salt. Set aside.
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In a medium bowl, beat the butter until smooth then slowly add the maple syrup, beating constantly.
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Beat in the sour cream and egg.
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Fold in the raisins.
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Add the dry ingredients to the wet ingredients, and stir until just blended.
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Spoon mixture into the prepared muffin tins, filling each cup about two-thirds full.
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Bake until a toothpick inserted in the center comes out clean, about 15 - 18 minutes.
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Cool in the tin for 5 minutes, then remove.