The Iced Oatmeal Cookie Bar Recipe offers a delightful twist on classic oatmeal cookies, transforming them into a deliciously easy-to-make bar. Perfect for gatherings, dessert tables, or simply a cozy afternoon treat, these bars combine the heartiness of oats with a sweet icing that adds an irresistible finish. Their chewy texture and rich flavors make them suitable for any occasion, from family celebrations to casual get-togethers.
Why You’ll Love This Recipe
- Easy to Make: With straightforward steps, this recipe is beginner-friendly and requires minimal effort.
- Delicious Flavor: The combination of warm spices like cinnamon and nutmeg gives these bars a comforting taste that everyone loves.
- Versatile: These cookie bars can be served at parties, as a snack, or even as a sweet breakfast option.
- Perfect for Sharing: The large bar format makes it easy to cut into portions for sharing with friends and family.
- Customizable Toppings: Feel free to experiment with different icings or add-ins like chocolate chips or nuts.
Tools and Preparation
To create these delightful iced oatmeal cookie bars, having the right tools on hand will make the process smoother and more enjoyable.
Essential Tools and Equipment
- Mixing bowls
- Electric mixer
- Baking pan (9×13 inch)
- Measuring cups and spoons
- Rubber spatula
- Cooling rack
Importance of Each Tool
- Electric mixer: Saves time and ensures thorough mixing of ingredients for a smooth batter.
- Baking pan: A sturdy 9×13 inch pan provides ample space for even baking of the cookie bars.
- Cooling rack: Allows the bars to cool evenly after baking, preventing sogginess.
Ingredients
For the Base
- Unsalted Butter: 1 cup (2 sticks or 226g), softened to room temperature
- Light Brown Sugar: 1 cup (200g), packed
- Granulated Sugar: 1/2 cup (100g)
- Large Eggs: 2
- Vanilla Extract: 2 teaspoons
- All-Purpose Flour: 1 1/2 cups (180g)
- Baking Soda: 1 teaspoon
- Ground Cinnamon: 1 1/2 teaspoons
- Ground Nutmeg: 1/2 teaspoon (optional, but highly recommended)
- Salt: 1/2 teaspoon
- Old-Fashioned Rolled Oats: 3 cups (270g) (not instant or quick-cooking)
For the Icing
- Powdered Sugar: 2 cups (240g), sifted
- Milk or Cream: 3-4 tablespoons (whole milk or heavy cream recommended for richness)
- Vanilla Extract: 1 teaspoon
- Pinch of Salt: (optional, to balance sweetness)
How to Make Iced Oatmeal Cookie Bar Recipe
Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C). This ensures that your cookie bars bake evenly.
Step 2: Prepare Your Baking Pan
Grease the baking pan lightly with butter or line it with parchment paper for easy removal after baking.
Step 3: Cream Butter and Sugars
In a large mixing bowl, combine the softened unsalted butter, light brown sugar, and granulated sugar. Use an electric mixer on medium speed until creamy and fluffy.
Step 4: Add Eggs and Vanilla
Add in the large eggs one at a time, mixing well after each addition. Stir in the vanilla extract until well combined.
Step 5: Mix Dry Ingredients
In another bowl, whisk together all-purpose flour, baking soda, ground cinnamon, ground nutmeg (if using), and salt.
Step 6: Combine Wet and Dry Mixtures
Gradually add the dry mixture to the wet mixture while mixing on low speed. Once combined, fold in the old-fashioned rolled oats until evenly distributed.
Step 7: Bake
Spread the batter evenly in your prepared baking pan. Bake for about 25–30 minutes or until golden brown. Let cool completely on a wire rack before icing.
Step 8: Prepare Icing
In a mixing bowl, combine powdered sugar, milk or cream, vanilla extract, and a pinch of salt. Mix until smooth.
Step 9: Ice the Bars
Once cooled, pour the icing over your cookie bars. Spread evenly with a spatula if needed.
Step 10: Slice and Serve
Let the icing set slightly before cutting into squares. Enjoy your delicious iced oatmeal cookie bars!
How to Serve Iced Oatmeal Cookie Bar Recipe
Serving your Iced Oatmeal Cookie Bar is just as important as making it. These delightful bars can be enjoyed in various ways that enhance their flavor and presentation.
With a Glass of Milk
- A classic pairing, the creaminess of milk complements the sweetness of the cookie bars perfectly.
Topped with Fresh Fruit
- Add sliced strawberries or bananas on top for a refreshing twist. The fruit adds color and balances the sweetness.
As a Dessert Platter
- Cut into smaller squares and arrange them on a platter with other desserts. This makes a great addition to any gathering or party.
Warmed with Ice Cream
- Heat individual bars in the microwave and serve with a scoop of vanilla ice cream. The warm cookie bar melts the ice cream, creating a delicious treat.
With Coffee or Tea
- Enjoy these bars alongside your favorite hot beverage. The flavors of coffee or tea pair beautifully with the spices in the cookies.
How to Perfect Iced Oatmeal Cookie Bar Recipe
To achieve the best results when making your Iced Oatmeal Cookie Bar, consider these helpful tips.
- Use room temperature ingredients: Ensure your butter and eggs are at room temperature for better mixing and texture.
- Don’t skip the oats: Using old-fashioned rolled oats gives the bars their chewy texture, so avoid instant oats.
- Sift powdered sugar before icing: This prevents lumps in your icing for a smooth finish.
- Adjust baking time based on your oven: Keep an eye on the bars while baking; every oven is different, so adjust accordingly.
- Let them cool completely before icing: This helps prevent the icing from melting into the bars, ensuring a beautiful presentation.

Best Side Dishes for Iced Oatmeal Cookie Bar Recipe
Pairing side dishes with your Iced Oatmeal Cookie Bar can elevate your dessert experience. Here are some great options to consider:
- Whipped Cream: Light and fluffy, this can be dolloped on top for extra indulgence.
- Fruit Salad: A mix of seasonal fruits provides a refreshing contrast to the sweet bars.
- Yogurt Parfait: Layer yogurt with granola and berries for a satisfying balance.
- Cheese Plate: A selection of cheeses can add savory notes that complement the sweetness.
- Chocolate Sauce: Drizzle over each bar for an extra touch of decadence.
- Nut Mix: A bowl of mixed nuts adds crunch and richness alongside the soft cookie bars.
Common Mistakes to Avoid
When making the Iced Oatmeal Cookie Bar Recipe, it’s easy to encounter some common pitfalls. Here are a few mistakes to watch for:
- Incorrect measurements: Using too much or too little of any ingredient can alter the texture and taste. Always measure your ingredients accurately, especially the flour and oats.
- Skipping the cooling time: If you try to ice the bars while they are still warm, the icing will melt. Allow them to cool completely before frosting for the perfect finish.
- Using quick oats: Quick-cooking oats will make your bars mushy rather than chewy. Stick with old-fashioned rolled oats for the right texture.
- Overmixing the batter: Mixing too much can lead to tough cookie bars. Mix until just combined to keep them soft and chewy.
- Ignoring optional spices: Leaving out spices like nutmeg can result in a less flavorful bar. Consider adding them for an extra depth of flavor.
Storage & Reheating Instructions
Refrigerator Storage
- item Store in an airtight container.
- item Iced Oatmeal Cookie Bars can last up to 1 week in the fridge.
- item Place parchment paper between layers to prevent sticking.
Freezing Iced Oatmeal Cookie Bar Recipe
- item Wrap tightly in plastic wrap or aluminum foil.
- item They can be frozen for up to 3 months.
- item Thaw in the fridge overnight before serving.
Reheating Iced Oatmeal Cookie Bar Recipe
- Oven: Preheat to 350°F (175°C) and warm for about 10 minutes until heated through.
- Microwave: Heat on low power for 15-20 seconds until just warmed.
- Stovetop: Place in a skillet over low heat, cover, and warm gently for a few minutes.

Frequently Asked Questions
Can I use gluten-free flour in this Iced Oatmeal Cookie Bar Recipe?
Yes, you can substitute all-purpose flour with a gluten-free flour blend. Ensure it’s suitable for baking for best results.
How do I make my icing thicker?
To achieve a thicker icing, add more powdered sugar gradually until you reach your desired consistency.
Can I customize this recipe?
Absolutely! Feel free to add chocolate chips, nuts, or dried fruits to enhance flavors and textures according to your preference.
What’s the best way to serve these cookie bars?
Iced Oatmeal Cookie Bars are delightful served chilled or at room temperature. Pair them with a cup of coffee or tea for a delightful treat!
Final Thoughts
The Iced Oatmeal Cookie Bar Recipe is both delicious and versatile, allowing you to customize it based on your taste preferences. With its rich flavors and chewy texture, these bars are sure to become a favorite. Don’t hesitate to experiment with different mix-ins or toppings—your creativity will make every batch unique! Try this recipe today; you won’t be disappointed!

Iced Oatmeal Cookie Bar Recipe
- Total Time: 45 minutes
- Yield: Approximately 12 servings 1x
Description
Indulge in the deliciously simple Iced Oatmeal Cookie Bar Recipe, a delightful twist on traditional oatmeal cookies that transforms them into easy-to-make bars perfect for any occasion. These chewy bars combine the heartiness of rolled oats with a sweet, creamy icing, making them an ideal treat for gatherings or cozy afternoons at home. The warm spices of cinnamon and nutmeg add comforting flavors that everyone will love. Whether enjoyed as a snack, dessert, or even breakfast, these cookie bars are versatile and customizable. With options to add chocolate chips or nuts, each batch can reflect your unique taste. Create lasting memories by sharing these sweet treats with friends and family.
Ingredients
- 1 cup unsalted butter
- 1 cup light brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 1 1/2 cups all-purpose flour
- 3 cups old-fashioned rolled oats
- For icing: 2 cups powdered sugar, milk or cream
Instructions
- Preheat oven to 350°F (175°C) and grease a 9×13 inch baking pan.
- In a mixing bowl, cream together butter and sugars until fluffy.
- Add eggs one at a time along with vanilla extract; mix well.
- In another bowl, whisk together flour, baking soda, cinnamon, nutmeg (if using), and salt.
- Gradually combine dry ingredients with wet mixture; fold in oats.
- Spread batter in prepared pan and bake for 25–30 minutes until golden brown.
- Allow to cool completely before icing with the mixture of powdered sugar, milk or cream.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 bar (60g)
- Calories: 210
- Sugar: 15g
- Sodium: 150mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 31g
- Fiber: 2g
- Protein: 3g
- Cholesterol: 30mg
Keywords: Use room temperature ingredients for better mixing. Experiment with different toppings like chocolate chips or dried fruits for added flair. Store leftovers in an airtight container in the fridge for up to one week.