This classic iced oatmeal cookies recipe makes soft, chewy cookies with warm spices and a crackly vanilla glaze. A nostalgic frosted favorite made from scratch.
Preheat your oven to 350°F. Line two baking sheets with parchment paper.
Pulse oats: Add 1 cup of the oats to a food processor and pulse until it becomes a coarse meal, about 5–10 seconds. Combine with the remaining 1 cup of whole oats.
Mix dry ingredients: In a medium bowl, whisk together the 2 cups oats, 2 cups all-purpose flour, 1 tablespoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt, 2 teaspoons cinnamon, and ¼ teaspoon nutmeg.
Cream butter and sugars: In a large bowl using a hand mixer (or stand mixer), cream the 1 cup softened butter, 1 cup brown sugar, and ½ cup granulated sugar until light and fluffy, about 2–3 minutes.
Add egg and vanilla: Mix in the 2 large eggs and 1 teaspoon vanilla extract until well combined.
Combine: Gradually add the dry ingredients to the wet mixture and mix until just combined. Do not overmix.
Scoop and bake: Use a cookie scoop or tablespoon to portion dough onto the prepared baking sheets, spacing about 2 inches apart. Bake for 12–14 minutes, or until the edges are lightly golden.
Cool: Let cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
Make the glaze: In a small bowl, whisk together the 2 cups powdered sugar, 3 tablespoons milk, and ½ teaspoon vanilla extract. Add more milk as needed to reach a pourable consistency.
Glaze cookies: Once cookies are completely cool, dip the tops into the icing or drizzle it over. Let the glaze set before storing. Enjoy!