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Preheat the oven to 350°F.
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Grease muffin pan. Set aside.
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In a large bowl, lightly whisk eggs with sour cream, oil, and sweet potato mash.
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Beat in the brown sugar and vanilla.
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Add flour, baking powder, cinnamon, baking soda, nutmeg, and salt.
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Fold in half the walnuts, mix until just combined.
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Divide the batter between the 12 prepared muffin wells.
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Sprinkle with remaining walnuts and raw sugar.
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Bake for 18 – 20 minutes.
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Cool on a wire rack before transferring to an airtight container.