Chef John's Sweet Potato Muffins

Ingredients (16)

• + non-stick cooking spray add to pantry
• + 2 cups all-purpose flour add to pantry
• + 2 teaspoons baking powder add to pantry
• + 2 teaspoons cinnamon add to pantry
• + 1 teaspoon kosher salt add to pantry
• + 1 teaspoon baking soda add to pantry
• + ½ teaspoon ground ginger add to pantry
• + 1 pinch freshly grated nutmeg add to pantry
• ✓ 4 large eggs
• + 1 ½ cups white sugar add to pantry
• + ½ cup light brown sugar add to pantry
• + 1 cup vegetable oil add to pantry
• + ¼ cup melted butter add to pantry
• + 2 cups mashed sweet potato (yams) add to pantry
• + 1 cup chopped pecans, plus more for topping add to pantry
• + 2 teaspoons demerara sugar for topping add to pantry