iced oatmeal cookies

INGREDIENTS

• Butter for baking sheets
• 2 1/2 cups + 1 tablespoon (8 1/4 ounces or 231 grams) old fashioned oats
• 1/2 cup (2 1/4 ounces or 65 grams) whole wheat flour
• 1 cup (4 3/8 ounces or 125 grams) all-purpose flour*
• 1 tablespoon plus 1 teaspoons (20 grams) baking powder
• 1 teaspoon (5 grams) baking soda
• 2 teaspoons kosher salt**
• 1 cup (8 3/8 ounces or 238 grams) dark brown sugar
• 1/2 cup (3 1/2 ounces or 100 grams) granulated sugar
• 1 teaspoon (2 grams) cinnamon
• 1 teaspoon (2 grams) freshly grated nutmeg (I used less, because I was nutmeg-wary, but wouldn’t have minded more)
• 8 ounces (2 sticks) unsalted butter, melted
• 2 large eggs
• 2 1/4 (9 1/2 ounces or 270 grams) cups powdered sugar
• 5 to 6 (75 to 90 ml) tablespoons whole milk
• 1 tablespoon (6 grams) cinnamon
• 1/4 teaspoon kosher salt**