Cooking spray
1½ sticks/6 ounces/170g unsalted butter
2 tablespoons/35g freshly grated ginger or 1½ teaspoons/3g ground ginger
2 teaspoons/4g ground cinnamon
½ teaspoon/1g ground nutmeg
1½ cups/255g all-purpose flour
1 tablespoon/12g baking powder
1 teaspoon/6g baking soda
1½ teaspoons/6g kosher salt
1 (15-ounce/425g) can unsweetened pumpkin puree (about 1½ cups)
2 large eggs
1 cup/315g maple syrup
3/4 cup/135g light brown sugar
Double recipe Salty Vanilla Frosting (optional)