Iced Oatmeal Cookie Bars

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These Iced Oatmeal Cookie Bars are everything you love about the classic cookie, baked into an easy-to-slice bar form. For those craving soft oatmeal cookie bars with icing, you get the same warm spice flavor, soft and chewy texture, and sweet vanilla icing on top, but without having to scoop individual cookies.

Why You’ll Love These Iced Oatmeal Cookie Bars

• All the flavor of chewy iced oatmeal bars in a simple press-and-bake recipe.
• Perfect delicious treat for potlucks, bake sales, or holiday trays where you can easily share.
• Easy to make quick one-pan bars with pantry staples and no chill time.
• Sweet icing sets beautifully for stacking or gifting.
• Adaptable! make them with gluten-free oats and flour if needed.

Gather Your Ingredients

Iced Oatmeal Cookie Bar Recipe

• 1 cup unsalted butter, room temperature
• 1 cup brown sugar
• 1/3 cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 1/2 cups all-purpose flour or gluten-free flour substitute
• 1 teaspoon baking powder
• 1 1/2 teaspoons cinnamon
• 1/2 teaspoon nutmeg
• 1/2 teaspoon salt
• 3 cups old-fashioned oats (do not use quick oats)

Vanilla Icing

• 1 1/2 cups powdered sugar
• 2-3 tablespoons milk of choice or heavy cream
• 1 teaspoon vanilla extract
• Dash of salt

Instructions How to Make Iced Oatmeal Cookie Bars

1. Preheat oven to 350°F (177°C). Grease and flour a 9×13 baking dish or line with parchment for easy removal.
2. In a large mixing bowl, beat butter and sugars until light and fluffy, about 2–3 minutes.
3. Add eggs and vanilla; beat until smooth.
4. In another bowl, whisk flour, baking powder, cinnamon, nutmeg, and salt.
5. Mix dry ingredients into wet on low speed until just combined.
6. Add oats and mix on low until incorporated. Avoid overmixing.
7. Press dough evenly into prepared pan.
8. Bake 25–35 minutes until edges are golden brown and a toothpick inserted in the center comes out with moist crumbs.
9. Cool completely before adding icing to your oatmeal cookie bars.

Vanilla Icing

1. Whisk powdered sugar, salt, milk or cream, and vanilla in a bowl until glossy. Adjust consistency by adding more sugar to thicken or milk to thin.

Assembling the Bars

1. Lift cooled bars from the pan using parchment, if used. Cut into bars and drizzle or spread icing over the top. Let set before storing. This final touch is essential for perfect iced oatmeal cookie bars.

How to Store

• Store these soft oatmeal cookie bars with icing in an airtight container at room temperature for up to 4 days. Separate layers with parchment to keep the icing intact.
• For longer storage, freeze for up to 2 months and thaw before serving.

More Variations

• Add raisins or dried cranberries for extra chewiness.
• Mix in white chocolate chips for a sweeter twist.
• Swap the vanilla icing for a maple glaze for fall flavor, adding a twist to your bars.

FAQs for this Old-Fashioned Iced Oatmeal Cookie Bar Recipe

Can I make these as gluten-free iced oatmeal cookie bars?

• Yes, use certified gluten-free oats and a gluten-free flour blend to make your cookie bars gluten-free.

Can I make these soft oatmeal cookie bars with icing thicker?

• Yes, bake in a smaller 9×9 pan and increase baking time slightly for thicker bars.

Why are my bars dry?

• Overbaking will cause dryness. Check a few minutes early for doneness.

In conclusion, these chewy iced oatmeal bars are a delicious spin on the classic cookie, easy enough for a weekday bake yet special enough for celebrations. You’ll love how simple they are to make and how quickly they disappear. Baking iced oatmeal cookie bars offers both convenience and flavor.

Want more quick ideas and dessert inspo? Follow on Pinterest, Instagram and Facebook for recipe updates, baking tips, and lots of sweet inspiration.

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Iced Oatmeal Cookie Bars

Kim Lange

Chewy iced oatmeal cookie bars with warm cinnamon spice and a sweet vanilla glaze. Easier than scooping cookies and perfect for sharing.

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Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 25 minutes mins

Total Time 40 minutes mins

Course Dessert, Snack

Cuisine American

Servings 24 bars

Calories 217 kcal

Ingredients

  

1x2x3x

• 1 cup unsalted butter room temperature
• 1 cup brown sugar
• ⅓ cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 ½ cups all-purpose flour or gluten-free flour substitute
• 1 teaspoon baking powder
• 1 ½ teaspoons cinnamon
• ½ teaspoon nutmeg
• ½ teaspoon salt
• 3 cups old-fashioned oats do not use quick oats
• Vanilla Icing:
• 1 ½ cups powdered sugar
• 2-3 tablespoons milk of choice or heavy cream
• 1 teaspoon vanilla extract
• Dash of salt

Instructions

 

• Preheat oven to 350°F (177°C). Grease and flour a 9x13 baking dish or line with parchment for easy removal.
• In a large mixing bowl, beat butter and sugars until light and fluffy (2–3 minutes).
• Add eggs and vanilla. Beat until smooth.
• In another bowl, whisk flour, baking powder, cinnamon, nutmeg, and salt.
• Add dry ingredients to wet ingredients and mix on low speed until just combined.
• Add oats and mix on low until incorporated. Do not overmix.
• Press dough evenly into prepared pan.
• Bake for 25–35 minutes, until edges are golden and a toothpick inserted in the center comes out with moist crumbs.
• Cool completely in the pan before adding icing.
• Make the icing by whisking powdered sugar, salt, milk or cream, and vanilla in a bowl until glossy. Adjust thickness with more sugar or milk as needed.
• Lift cooled bars from the pan using parchment if used. Cut into bars and drizzle or spread icing on top. Let set before storing.

Notes

• For gluten-free bars, use certified gluten-free oats and a gluten-free flour blend.
• Do not overbake to keep the bars chewy; start checking for doneness a few minutes early.
• For a thicker icing layer, spread instead of drizzling.
• Storage: Store at room temperature in an airtight container for up to 4 days. Freeze (without icing) up to 2 months; add icing after thawing.

Nutrition

Calories: 217kcalCarbohydrates: 33gProtein: 3gFat: 9gSaturated Fat: 5gPolyunsaturated Fat: 1gMonounsaturated Fat: 2gTrans Fat: 0.3gCholesterol: 37mgSodium: 54mgPotassium: 82mgFiber: 1gSugar: 19gVitamin A: 261IUVitamin C: 0.01mgCalcium: 29mgIron: 1mg

Keyword icing, oatmeal bars, oats

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