The Iced Oatmeal Cookie Bar Recipe is a delightful treat that combines the classic flavors of oatmeal cookies with a sweet, creamy icing. These cookie bars are perfect for any occasion, from family gatherings to cozy nights in. What makes this recipe stand out is its easy preparation and the irresistible texture that appeals to both young and old alike. You’ll love how simple it is to whip up these bars, making them an excellent choice for last-minute desserts or meal prep!
Why You’ll Love This Recipe
- Easy to Make: This recipe requires simple ingredients and minimal steps, making it beginner-friendly.
- Delicious Flavor: The combination of oats, spices, and creamy icing creates a satisfying taste that you’ll crave.
- Versatile: Perfect for dessert trays, potlucks, or just a sweet snack at home.
- Family-Friendly: Kids love these bars, and they are great for sharing with friends.
- Make Ahead Option: These cookie bars store well, so you can bake them ahead of time.

Tools and Preparation
To make the Iced Oatmeal Cookie Bar Recipe, gather your tools before you start. Having everything ready will streamline your baking process.
Essential Tools and Equipment
- Mixing bowls
- Electric mixer
- Baking pan (9×13 inches)
- Measuring cups and spoons
- Rubber spatula
Importance of Each Tool
- Electric mixer: Saves time and effort when creaming butter and sugar together.
- Baking pan: A 9×13-inch pan is ideal for even cooking and easy serving.
- Rubber spatula: Perfect for scraping down the sides of bowls to ensure all ingredients are well combined.
Ingredients
For the Bars
- 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 even baking for your cookie bars.
Step 2: Cream Butter and Sugars
In a mixing bowl:
1. Add the softened butter, light brown sugar, and granulated sugar.
2. Beat with an electric mixer on medium speed until fluffy.
Step 3: Add Eggs and Vanilla
- Add the eggs one at a time, mixing well after each addition.
- Stir in the vanilla extract until fully combined.
Step 4: Combine Dry Ingredients
In another bowl:
1. Whisk together flour, baking soda, cinnamon, nutmeg (if using), and salt.
2. Gradually add this mixture to the wet ingredients while mixing.
Step 5: Incorporate Oats
Fold in the rolled oats until evenly distributed throughout the batter.
Step 6: Bake
Pour the mixture into a greased baking pan:
1. Spread evenly using a rubber spatula.
2. Bake for about 25–30 minutes or until golden brown.
Step 7: Prepare Icing
While the bars cool:
1. In a bowl, mix powdered sugar with milk or cream to achieve desired consistency.
2. Stir in vanilla extract and a pinch of salt if desired.
Step 8: Ice the Bars
Once cooled:
1. Spread icing evenly over the top of the cookie bars.
2. Let set before cutting into squares.
Enjoy your homemade Iced Oatmeal Cookie Bars, perfect for any gathering!
How to Serve Iced Oatmeal Cookie Bar Recipe
Serving your Iced Oatmeal Cookie Bars can enhance their delightful flavors. Here are some creative and delicious ways to serve them, perfect for any occasion.
With a Scoop of Ice Cream
- Vanilla Ice Cream: The classic pairing with oatmeal bars that adds creaminess and a sweet contrast.
- Cinnamon Ice Cream: Elevates the spice notes from the bars for a cozy dessert experience.
Drizzled with Caramel Sauce
- Warm Caramel: A warm drizzle adds richness and extra sweetness, making each bite decadent.
- Salted Caramel: Adds a touch of saltiness that complements the sweetness beautifully.
With Fresh Fruit
- Sliced Bananas: Their natural sweetness pairs well with the oatmeal flavor.
- Berries: Strawberries or blueberries add freshness and a burst of color to your dessert plate.
At Coffee Time
- Pairing with Coffee: Enjoy these bars with your favorite brew; the cinnamon notes enhance your coffee experience.
- Cold Brew: The chilled coffee offers a refreshing contrast to the sweet bar.
How to Perfect Iced Oatmeal Cookie Bar Recipe
Perfecting your Iced Oatmeal Cookie Bar Recipe elevates this treat from good to great. Follow these tips for an exceptional bake.
- Use Room Temperature Butter: Softened butter ensures better creaming with sugars, leading to a lighter texture.
- Do Not Overmix the Batter: Mix just until combined to avoid tough bars; this helps keep them chewy.
- Sift Powdered Sugar: Sifting ensures a smooth icing without lumps, making it easier to spread on the cookie bars.
- Let Bars Cool Completely: Allowing them to cool prevents the icing from melting and keeps it intact; this ensures beautiful presentation.
- Add Extra Spices: Enhance flavor by adding more cinnamon or nutmeg for warmth and depth in every bite.
Best Side Dishes for Iced Oatmeal Cookie Bar Recipe
Pairing side dishes with your Iced Oatmeal Cookie Bars can complement their flavors and create a balanced meal or snack. Here are some great options:
- Fresh Fruit Salad: A mix of seasonal fruits provides freshness and balances the sweetness of the bars.
- Yogurt Parfait: Layered yogurt with granola offers crunch and creaminess alongside the soft cookie bars.
- Cheese Platter: Soft cheeses like brie or cream cheese can create a savory contrast with the sweet bars.
- Nut Mix: A simple mix of almonds, walnuts, and pecans adds crunch and texture that pairs well with oatmeal flavors.
- Chocolate Milkshake: The rich chocolate taste is an indulgent side that kids (and adults) will love alongside the cookie bars.
- Chai Tea: The warm spices in chai tea harmonize beautifully with cinnamon in the oatmeal cookies, creating a cozy dessert experience.
Common Mistakes to Avoid
When making your iced oatmeal cookie bars, it’s easy to slip up. Here are some common mistakes to watch out for.
- Ignoring Ingredient Temperature: Using cold butter can lead to dense bars. Always soften your butter to room temperature for the best texture.
- Mismeasuring Ingredients: Accurate measurements are crucial. Use a kitchen scale for dry ingredients and liquid measuring cups for wet ones.
- Overmixing the Dough: Overmixing can make your bars tough. Mix just until ingredients are combined for a softer cookie bar.
- Skipping the Oats: Not using old-fashioned oats can change the texture dramatically. Always choose rolled oats for this recipe.
- Not Allowing Bars to Cool Fully: Cutting into warm bars can lead to a crumbly mess. Let them cool completely before slicing.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- Keep in the fridge for up to one week.
Freezing Iced Oatmeal Cookie Bar Recipe
- Wrap each bar individually in plastic wrap or foil.
- Freeze for up to three months for best quality.
Reheating Iced Oatmeal Cookie Bar Recipe
- Oven: Preheat to 350°F (175°C). Place bars on a baking sheet, cover with foil, and heat for about 10-15 minutes.
- Microwave: Heat individual bars on a microwave-safe plate for 15-20 seconds or until warm.
- Stovetop: Place in a non-stick skillet over low heat, flipping occasionally until warmed through.
Frequently Asked Questions
Here are some commonly asked questions about the iced oatmeal cookie bar recipe that might help you out!
Can I use quick-cooking oats instead?
You should avoid using quick-cooking oats, as they will not provide the same chewy texture as old-fashioned oats.
How do I know when my bars are done baking?
Look for golden edges and a set center; they will continue cooking slightly after being removed from the oven.
Can I customize the icing?
Absolutely! Feel free to add flavors like almond extract or lemon juice to your icing for a different twist.
What is the best way to cut these cookie bars?
Use a sharp knife and make clean cuts after they have cooled completely to avoid crumbling.
Final Thoughts
The iced oatmeal cookie bar recipe is not only delicious but also incredibly versatile. You can easily customize it with different mix-ins like chocolate chips or nuts. Try this comforting treat today, and enjoy the sweet satisfaction it brings!

Iced Oatmeal Cookie Bar Recipe
- Total Time: 45 minutes
- Yield: Approximately 12 servings 1x
Description
Indulge in the comfort of homemade Iced Oatmeal Cookie Bars, a delightful fusion of chewy oatmeal goodness topped with creamy icing. This family-friendly treat is perfect for gatherings, potlucks, or cozy nights at home. With their rich flavors and soft texture, these bars are sure to satisfy any sweet tooth. Easy to make and requiring minimal ingredients, they’re ideal for both novice bakers and seasoned pros alike. Whether enjoyed fresh from the oven or stored for later, these delicious bars will quickly become a favorite in your dessert repertoire.
Ingredients
- 1 cup unsalted butter (softened)
- 1 cup light brown sugar (packed)
- 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/cream, vanilla extract
Instructions
- Preheat oven to 350°F (175°C).
- In a mixing bowl, cream together softened butter and sugars until fluffy.
- Beat in eggs one at a time, followed by vanilla.
- In a separate bowl, whisk flour, baking soda, spices, and salt; gradually blend into wet mixture.
- Fold in rolled oats until combined.
- Spread batter evenly in greased 9×13-inch baking pan and bake for 25–30 minutes until golden.
- Cool completely before icing with a mixture of powdered sugar and milk or cream.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 serving
- Calories: 210
- Sugar: 14g
- Sodium: 105mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 31g
- Fiber: 2g
- Protein: 2g
- Cholesterol: 35mg