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5-Ingredient Blueberry Oat Breakfast Bars {vegan, oil-free}

Have a very good morning with my 5-ingredient blueberry oat breakfast bars ! They are vegan, added sugar-free, oil-free, gluten-free & only 75 calories each.
5-Ingredient Blueberry Oat Bars on a blue napkin

Healthier Fruit-Filled Cereal Bars

I love the idea of a fruit-filled, portable cereal bar.

I don’t love the reality of ready-to-eat cereal bars from the grocery store, including the organic, all-natural, “healthy” options.

In fact, I don’t like them at all. Mostly, I find them far too sweet and insubstantial (i.e., I am hungry again in about 15 minutes). Further, what is being added to the cereal layer? No matter the brand, it always tastes weird.

So I made my own version: Blueberry Oat Breakfast Bars.

A hand holding a cut blueberry oat bar, showing the thick fillling

Why these Blueberry Oat Breakfast Bars Are Worth Making

First things first: these are very, very easy to make.

Second: the recipe has 5 ingredients (excluding water and salt).

Third: the recipe has no added sugar or fat. However, you can add either or both to your liking. You can also add spices and flavoring to suit your tastes. I like flexibility.

Fourth: the bars are also naturally vegan, gluten-free and have 75 calories apiece.

Sound good? Well here’s what you need to make them: blueberries (fresh or frozen (thawed)), oats, arrowroot or tapioca starch, very ripe banana, and flaxseed meal (read on if you cannot have flaxseed meal).

Overhead shot of the ingredients for5-Ingredient blueberry oat breakfast bars

Not to worry if you cannot eat flaxseed meal. The purpose of its addition here is to add some fat, without adding oil, as well as some extra nutrition.

You can sub any number of other ingredients, including equal amounts of almond meal/flour, ground chia seeds, hemp hearts, or other finely ground nuts or seeds. You can also add more ground oats, but the oat layers will be a bit more dense without the added fat.

Banana hater? Don’t worry, I’ve got you covered, too. See the recipe notes for using applesauce.

How to Make the Bars

Ok, let’s make these bars. First, make the oat layers. In a food processor, process 1-1/2 cups of the oats into a flour. Next, combine the oat flour with the remaining 1 cup oats, the flax, mashed banana (use super-ripe, mushy bananas for maximum sweetness), 3 tablespoons water,  and (optional) salt.

Adjust the Oat Crust/Crumble to Taste

Mix until combined and crumbly. The oat mixture will not be very sweet, which I like. It will have a toasty flavor after baking that suits my breakfast preferences. If you want your oats sweeter, go ahead and adjust. Add a bit of coconut sugar, monkfruit, a keto-style sweetener, or replace some of the water with maple syrup.

Two more options to consider: First, add flavoring(s) to your liking (e.g., cinnamon, cardamom, pumpkin pie spice, ginger, vanilla, almond extract, lemon zest). Second, add some fat. You can replace some or all of the water with the oil of your choice, which will result in crispier oat layers. It’s all up to you!

Make the Blueberry Filling

Now, make the filling. It’s a snap. Coarsely mash the berries with a fork, sprinkle with the arrowroot, and stir to combine.

You can customize here, too: if you want your berries sweeter, add some sweetener. Monkfruit, maple syrup, stevia, coconut sugar, whatever you like. Any given batch of berries can be more or less sweet, so taste and decide what works for you.

I also like to add a pinch of salt, to enhance the sweetness, but it is optional. Adding a drop of vanilla or almond extract, or some lemon zest, is also a fine & delicious idea.

Press half of the oat mixture firmly and evenly into a parchment paper-lined baking pan (8-inches/ 20 cm square).

Spread with the berry filling and crumble the remaining oat mixture on top.

Time to Bake

Bake in a preheated 350F (175C) oven for 25 to 30 minutes until the topping is golden and the filling is bubbly. Transfer to a wire rack and cool completely.

Once the bars are cool, refrigerate until they are cold. Use the parchment paper overhang to remove the bars from the pan and cut into 16 squares (or bigger bars, if you like).

These are definitely my kind of breakfast bars.

I hope you enjoy these bars as much as I do! I am sure they would be smashing with other summer fruits, including raspberries, cherries, blackberries, peaches, plums, and apricots.

Happy baking!

Close-up of a 5-Ingredient blueberry oat breakfast bar

More Amazing Oat Recipes to Try:

Oat Flax Skillet Bread {3 ingredients, vegan, oil-free, GF}

Healthy Oat Blender Muffins {Vegan, Oil-Free, GF}

3-Ingredient Vegan Oat Muffins

Healthy Oat Gingerbread {vegan}

Pumpkin Oat Blender Muffins {vegan, oil-free, GF}

5 ingredient Blueberry Oat Breakfast Bars {vegan, sugar-free, oil-free, gluten-free}

5 ingredient Blueberry Oat Breakfast Bars {vegan, sugar-free, oil-free, gluten-free}

Yield: 16 bars
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes

Have a very good morning with one of my 5-ingredient, easy-to-make blueberry oat breakfast bars that are vegan, added sugar-free, oil-free, and gluten-free. Each bar has only 75 calories and the recipe can be customized as much as you like


Oat layers:

  • 2 and 1/2 cups (225 g) rolled oats (certified GF, as needed), divided
  • 3/4 cup (175 mL) mashed very ripe banana
  • 1/4 cup (26 g) flaxseed meal
  • 3 tablespoons (45 mL) water
  • 1/4 teaspoon fine sea salt

For the filling:

  • 2 cups (500 mL) blueberries (fresh, or frozen (thawed))
  • 1 tablespoon tapioca starch or arrowroot starch (cornstarch will work, too)
  • (Pptional) Pinch of sea salt


  1. Preheat oven to 350F (175C). Line an 8 inch (20 cm) square baking pan with parchment paper and spray with nonstick cooking spray. Set aside.
  2. Oat layers: In a food processor, process 1 and 1/2 cups (135 g) of the oats into a fine flour. In a large bowl, combine (use a fork) the oat flour, remaining 1 cup (90 g) oats, banana, flaxseed meal, water and salt until combined and crumbly.
  3. Filling: In a large bowl, coarsely crush the blueberries with a fork. Sprinkle the arrowroot over berries and stir to combine. If desired, add a pinch of salt.
  4. Assembly: Firmly press half of the oat mixture into the prepared pan, evenly tamping down. Evenly spread with the blueberry filling. Coarsely crumble remaining oat mixture over filling.
  5. Bake in the preheated oven for 25 to 30 minutes or until filling is bubbly and topping is golden. Cool completely, in the pan, on a wire rack. Refrigerate until cold.
  6. Remove from pan and cut into 16 bars.


Storage: Store the cooled bars in an airtight container in the refrigerator for 1 week, or the freezer for up to 6 months.

Tips for adding more sweetness, fat (for crispness) and flavor: I like the minimally sweet flavor of these bars, but you can tailor them to suit your preferences. Taste both the uncooked banana oat mixture and the blueberries and decide if you want them sweeter. For crispier oat layers, feel free to add some fat by replacing some or all of the water with the oil of your choice. And add flavorings (spices, vanilla extract, almond extract lemon zest) in the oat layers or filling, as you like!

Flax substitute: If you cannot eat flax, replace it with an equal amount of ground chia seeds or almond meal/flour.

Banana Substitute: An equal amount of applesauce can be used in place of the banana. It will not be sweet, so you may want to add a bit of sweetener (of your choosing) to taste.

Oat Notes: Either old-fashioned or quick-cooking oats can be used in the recipe.

Nutrition Information
Serving Size 1 bar (1/16 of recipe)
Amount Per Serving Calories 75Total Fat 1.5gSaturated Fat 0.1gCholesterol 0mgSodium 37.6mgCarbohydrates 14.3gFiber 2.5gSugar 3.4gProtein 2.2g

Did you make this recipe?

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Friday 20th of October 2023

Just made these for breakfast for me and my kiddos. They were a hit! I topped them off with a sprinkle of lavender cinnamon sugar to add a touch more sweetness for the kids (and me ????). However even without the sugar on top these are delicious!! Thanks for the recipe!!


Sunday 22nd of October 2023

You are so welcome, Raquel! I'm so glad the recipe was enjoyed by the kiddos, too :)


Monday 15th of February 2021

Thanks so much for sharing this recipe Camilla! I made it yesterday and it was delicious. I doubled the batch and instead of just oats for each batch, I added in a mixture of pumpkin seeds, chia, and shredded coconut. I did add a little bit of oil as well, but the banana really did help it stay moist. Delicious, nutritious, and super easy to make with ingredients I already had on hand - would definitely make this again!


Sunday 24th of January 2021

Ok, I am seriously obsessed with this recipe! I have made it every Sunday this month for breakfasts for the week. I've made it with blueberries, strawberries, raspberries, and I just made it today with frozen mixed berries. I love that this recipe has no sugar in it - it truly does not need it!


Monday 21st of December 2020

I really appreciate this recipe, as so many "healthy" breakfast recipes still contain a lot of sugar and not much nutrition. I've tried this with fresh blueberries and with frozen, and both options turned out great! I would like to try some cardamom and lemon zest, too--will plan to add those next time. Thanks for the great recipe and helpful tips!


Thursday 17th of March 2022

You are so welcome, Carly!


Sunday 11th of October 2020

This recipe was so good. my family is in the begining stage of plant based transition, my husband was craving apple pie so i cooked some apples for the filling and added spices. it was so good and satisfying! thank you so much.


Friday 23rd of October 2020

You are so welcome, Danielle!

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