Spiced Pumpkin-Oatmeal Cookies Recipe

Ingredients

• 2 cups all-purpose flour
• 1 1/3 cups rolled oats (not instant)
• 1 1/4 teaspoons baking powder
• 1 1/2 teaspoons ground cinnamon
• 1 teaspoon ground ginger
• 1 teaspoon fine salt
• 1/2 teaspoon ground nutmeg
• 2 sticks (8 ounces) unsalted butter , at room temperature
• 1 cup packed dark brown sugar
• 1 cup granulated sugar
• 1 large egg , at room temperature
• 1 teaspoon vanilla extract
• 1 (15 ounce) can pumpkin purée (not pie filling; about 1 3/4 cups)
• 1 1/2 cups powdered sugar , sifted
• 3 tablespoons plus 1 teaspoon milk (not nonfat), plus more as needed
• 2 tablespoons maple syrup