
1 teaspoon baking powder
½ teaspoon baking soda
½ teaspoon fine salt
1 teaspoon ground cinnamon
½ teaspoon ground nutmeg
¼ teaspoon ground ginger
¾ cup (170 g) unsalted butter, softened
1 cup (200 g) light brown sugar, packed
1 large egg
2 teaspoons vanilla extract
2 tablespoons milk
2 cups (240 g) powdered sugar
2–3 tablespoons milk
1 teaspoon vanilla extract
Gel food coloring (orange, yellow, red, brown)