| Preheat the oven to 350° and butter the muffin tins. Whisk the eggs, brown sugar, oil, and vanilla in the large bowl. Mix the flour, baking powder, spices, salt, and potatoes in the medium bowl. Gradually add to the egg mixture, incorporating well. Stir in the raisins and walnuts. Pour the batter into muffin tins. Bake for 25-30 minutes until toothpick inserted in middle comes out clean. Serve immediately.
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