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Mixed Berry Oatmeal Bars

A simple and easy oat bar that is loaded full of berries that are bursting with sweetness. The hint of cinnamon offers a nice warm flavor to these hearty oat bars. 

If you are a fan of oats you will enjoy these mixed berry oatmeal bars. Simple ingredients and delicious!

Mixed Berry Oatmeal Bars Stacked On Blue white Checkered Napkin

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Mixed Berry Oatmeal Bars

These bars are so easy to throw together and make a wonderful snack for a mid-day treat, or serve up for breakfast. No matter when you serve them, these oat bars will be a hit. 

Variations To Recipe 

  • Consider swapping out different fruit to fill in for the bars. Or you could even do a mix of other berries such as blackberries, raspberries and more. 
  • You can use frozen fruit in place of fresh. 
  • Use orange juice to squeeze over instead of lemon juice. 
  • Double the recipe and bake in a 9x13 pan. 
Berry Oatmeal Bars on white plate drizzled with glaze

Ingredient List

  • 1 cup Rolled Oats
  • all purpose flour
  • light brown sugar
  • ground cinnamon
  • salt
  • unsalted butter – 1 stick, melted
  • strawberries – chopped small
  • blueberries – sliced in half
  • cornstarch
  • lemon, squeezed
  • granulated sugar

Glaze Ingredient List

  • powdered sugar
  • heavy cream
ingredients separated in white bowls

Full instructions and measurements are in the recipe card below. Scroll to the bottom to print.

How to Make Mixed Berry Oatmeal Bars 

Grease and preheat your oven as directed in the recipe card below. I find using parchment paper in the pan helps for easy removal of the bars. 

In a bowl mix up the rolled oats, flour, brown sugar, cinnamon and salt. Pour in the melted butter and mix until combined. Set half of the mixture to the side. 

Process step 1 and 2 Mixing ingredients in bowl

Pour part of the oats in the bottom of the pan, then top with berries, sprinkle cornstarch over the fruit. Squeeze fresh lemon juice over the top, half of the granulated sugar, and then add more fruit, and more sugar. 

Process step 3 and 4 layering ingredients in baking pan

Now add the next layer of the granola and bake for 40-45 minutes.

Berry Oat Bars In Baking Pan Ready for Oven

Once the fruit is bubbly and oats are golden brown remove and allow to cool on the counter. 

Let the bars cool then slice and serve. You can make a homemade glaze to drizzle over the bar if you want more sweetness or serve them plain.  

Glaze in bowl for berry oat bars

Tip: The butter and flour are what keeps your bars together. You will want to make sure that you pack down the top of the bars a little to ensure the oats stick together when you go to bake it in the oven. 

Mixed Berry Oatmeal Bars in Baking Pan Drizzled with Glaze

How To Store Leftover Oat Bars

I always put any leftover oat bars in an airtight container and store them in the refrigerator. They should keep for 3 days in the fridge. Eat chilled or warm them up for a few seconds in the microwave. 

If you will not be able to eat the bars within a few day, you can freeze them. Just pre-slice before putting them in the freezer.

Then just take them out and let them thaw in the refrigerator overnight or try thawing them on the counter for 30 minutes to an hour. 

Stacked Oatmeal Berry Bars on blue napkin

Can I Eat The Bars Warm From The Oven? 

If you want to eat these berry oat bars when they are fresh out of the oven, it will be more like a cobbler texture. It will be delicious and is really tasty with a scoop of ice cream on top. Or even a dollop of whipped cream. 

Mixed Berry Oatmeal Bars Stacked On Blue white Checkered Napkin

Mixed Berry Oatmeal Bars

Author: Judy Wilson
A simple and easy oat bar that is loaded full of berries that are bursting with sweetness.
Prep Time 15 minutes
Cook Time 40 minutes
Course Breakfast, Dessert
Cuisine American
Servings 9


  • 1 cup rolled oats
  • ¾ cup all purpose flour
  • cup light brown sugar
  • ¼ tsp ground cinnamon
  • ¼ tsp salt
  • ½ cup unsalted butter, melted
  • 1 cup chopped strawberries, chopped small size
  • 1 cup blueberries, sliced in half
  • 1 ½ tsp cornstarch
  • ½ lemon, squeezed
  • 1 tbsp granulated sugar

Glaze Ingredients

  • ½ cup powdered sugar
  • 2-7 tbsp heavy cream


  • Preheat oven to 375 degrees.
  • Spray a 8-inch baking pan with non-stick spray. Line pan with a sheet of parchment paper Leave an overhang and spray the paper for easy removal.
  • In a large bowl, whisk together the rolled oats, flour, brown sugar, cinnamon and salt.
  • Pour in the melted butter and mix until everything is combined and chunky. Set aside 1/2 cup of this mixture.
  • Pour the remaining mixture into the bottom of the prepared pan and pack down the crust.
  • Layer ½ of the strawberry and blueberry mixture over the crust
  • Sprinkle the cornstarch over the fruit then squeeze half of a lemon over the fruit, Next sprinkle half of the granulated sugar over it and then top with the remaining fruit.
  • Then sprinkle the remaining granulated sugar on top.
  • Spread the ½ cup mixture of granola on top.
  • Bake for 40 to 45 minutes, until the granola is starting to turn golden and the fruit is bubbling.
  • Set out to cool completely before cutting
  • Once cooled, mix 2 tbsp of the heavy cream in with the powdered sugar. Slowly add more cream until the desired consistency has been reached. Drizzle all over the bars.
  • Store leftovers in the refrigerator. These can be frozen.


If you choose to cut the bars while warm it will be more like a cobbler. I usually let them cool for about an hour and then refrigerate for a few hours to get a clean cut.
The nutritional information provided is approximate and should only be used as a general guideline. It is an estimate that will vary based on cooking methods and brands of ingredients used.
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Mixed Berry Oatmeal Bars Pinterest Pin

More Oat Recipes To Try

Oats are so versatile to use in recipes. Here are a few delicious recipes to try.

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