Chef John's Sweet Potato Muffins
Ingredients:
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non-stick cooking spray
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2 cups all-purpose flour
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2 teaspoons baking powder
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2 teaspoons cinnamon
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1 teaspoon kosher salt
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1 teaspoon baking soda
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½ teaspoon ground ginger
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1 pinch freshly grated nutmeg
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4 large eggs
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1 ½ cups white sugar
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½ cup light brown sugar
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1 cup vegetable oil
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¼ cup melted butter
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2 cups mashed sweet potato (yams)
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1 cup chopped pecans, plus more for topping
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2 teaspoons demerara sugar for topping