Old Fashioned Iced Oatmeal Cookies

Old Fashioned Iced Oatmeal Cookies recipe { lilluna.com } So delicious and includes oats, cinnamon, and nutmeg with a smooth powdered sugar glaze!

Hello Lil’ Luna readers! It’s me Natalie, from Life Made Simple.

Today I’m sharing these old fashioned iced oatmeal cookies- they taste a lot like Mother’s oatmeal cookies, only 100x better! Growing up my mom always made us oatmeal chocolate chip cookies, so naturally I love any cookie with a good amount of oatmeal in them. A few months ago I even went a little crazy and made some oatmeal cookies with rice krispies in them (which were awesome by the way)! However, I’ve always loved those iced oatmeal cookies, so I decided to try making them myself. I couldn’t believe how easy it was and how incredibly yummy they were! This recipe is definitely a keeper, one you’re going to want to make time and time again!

Old Fashioned Iced Oatmeal Cookies recipe { lilluna.com } So delicious and includes oats, cinnamon, and nutmeg with a smooth powdered sugar glaze!

There’s only one small catch. Don’t worry, it’s just a small step in the process. You’re going to need a food processor or blender to grind up some old-fashioned oats. It’s almost like we’re making a combo of oat flour and rolled oats. Just pour them in and pulse or grind 10-12 times. That’s it! Everything else is pretty standard with the exception of a little cornstarch to help thicken these cookies up a bit. It also helps create nice crispy tops too!

Old Fashioned Iced Oatmeal Cookies recipe { lilluna.com } So delicious and includes oats, cinnamon, and nutmeg with a smooth powdered sugar glaze!

When you have your dough mixed up it’ll be pretty soft and sticky. You might want to let it rest in the refrigerator for 20-30 minutes or so, that way your hands don’t get messy and the oats have a little time to absorb some moisture. Use a standard size cookie scoop to place them on lined sheets and bake them anywhere from 10-15 minutes. If you like softer oatmeal cookies stick to 10-11 minutes, if you’re like me and like crispy ones, go 14-15 minutes! All that’s left is to dip the tops in a super simple glaze. Once the glaze hardens they’re ready to be devoured… and trust me, they will be! These spiced oatmeal cookies are absolutely perfect for the holidays, everyone is sure to love them!

Old Fashioned Iced Oatmeal Cookies

Old Fashioned Iced Oatmeal Cookies Recipe

4.34 from 3 votes

Old Fashioned Iced Oatmeal Cookies. So delicious and includes oats, cinnamon, and nutmeg with a smooth powdered sugar glaze!

Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 10 minutes
Total Time 20 minutes
Servings 16
Calories 172 kcal
Author on lilluna.com



  • 1 cup old fashioned rolled oats
  • 1 cup al purpose flour and 2 tbsp
  • 1/2 tbsp baking powder
  • 1/4 tsp baking soda
  • 1/4 tsp salt
  • 1 1/4 tsp cinnamon
  • 1/4 tsp ground nutmeg
  • 8 tbsp butter softened
  • 1/2 cup brown sugar packed
  • 1/4 cup granulated sugar
  • 1 egg
  • 1 tsp vanilla extract


  • 1 cup powdered sugar
  • 1/4 tsp vanilla extract
  • 1 1/2 tbsp milk
  • 1/4 tsp vanilla extract


  1. Preheat oven to 350 degrees. Line baking sheets with parchment paper or baking mats.

  2. Pour oats into a food processor and pulse about 10-12 times (you want it to be an even mix of ground and whole oats). In a medium size bowl, combine the oats, flour, cornstarch, baking powder, baking soda, salt, cinnamon and nutmeg, whisk together.
  3. In a large mixing bowl or the bowl of a stand mixer, cream the butter, sugars and vanilla extract together until light and fluffy, about 2 minutes on high speed. With mixing speed on low, add the egg and mix until incorporated. Gradually add the dry ingredients, mixing just until combined. The dough is fairly soft so I prefer refrigerating it for 20-30 minutes before rolling, that way my hands aren't a mess and it gives it time to rest.
  4. Using a standard size cookie scoop, place balls of dough onto each sheet. Place in the oven and bake for 10-14 minutes. I prefer crisp iced oatmeal cookies so I leave mine in for the full 14.
  5. Remove from the oven and allow to cool on the sheets for 3 minutes before transferring to a wire rack to cool completely.
  6. Once the cookies are cool, whisk together all of the ingredients for the glaze in a small mixing bowl. Dip the tops of the cookies in and swirl to remove any excess. Allow to set for 30 minutes.

Thanks again Kristyn for having me!

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Natalie - Recipe Contributor———————————————————–

Oh my!! Don’t these look like they came straight from the local bakery?!

They not only look delicious but beautiful. And yes, I can say that about cookies. 😉

Thank you, Natalie!!

For more great recipes from her be sure to check out Life Made Simple.

For more delicious recipes from Natalie on the site check out:

Homemade Chicken Stroganoff - this stuff is so delicious and is a recipe perfect for dinner any night. Tastes better than restaurant Stroganoff!!

Chicken Stroganoff

DELICIOUS Cherry Almond Cupcakes with homemade buttercream frosting!! This dessert is DELICIOUS!

Cherry Almond Cupcakes

Crispy Baked Sweet Potato Fries - these are seriously so delicious! If you love these at the restaurants you'll LOVE this recipe! Sweet Potatoes full of flavor and so crunchy!!

Crispy Baked Sweet Potato Fries

For all dessert recipes on the site go HERE.

For all recipes go HERE.

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Natalie Dicks

I’m the food photographer and blogger behind Life Made Simple. I’m passionate about creating from scratch family-friendly recipes ranging from healthy to decadent.

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  1. I see in the description that you mention cornstarch, but I don’t see it in the recipe. I am making them now and I’m wondering how much goes in? ????I’m sure I won’t get a response in time, so I might go ahead and guess and see how it goes! Thanks!

      1. 5 stars
        Thank you for your response! ????I went ahead and guessed, using 1tsp. of cornstarch. It worked! They were absolutely wonderful! Definitely vying for my favorite cookie now! ????thanks again for getting back to me!

  2. 4 stars
    the amount of cornstarch to use is not included so i just did 1/4 teaspoon….. and vanilla extract is listed twice in the icing. good receipe though.. thanks

  3. Can I freeze these cookies then ice them later? I’m baking them now for christmas. Normall I bake all my cookies, freeze them, then take out a few hours before serving and gthey taste super fresh. Just wonedering if you’ve Done this with this recipe

  4. 4 stars
    I loved this recipe‼️ I gave 4 stars only bEcause of 2 mistakes… cornstarch not listed & vanilla extRact listed twice.
    I used🙏🏼; 1/4 Tsp cornstarch
    1/4 tsp vanilla extract
    Worked out gReat👍🏼
    Thanks for the recipe‼️

  5. Just wondering, is it a typo or did y lea it out of the ingredients list? In the instructions when mixed the dry stuff together, “cornstarch” is listed. Is it supposed to be in the recipe?