These Gluten-Free Blueberry Oatmeal Bars are the perfect blend of cozy and classic — with a buttery oat crumble and a jammy blueberry filling that tastes like summer. Each bite is soft in the center, golden and crisp on the edges, and bursting with bright blueberry flavor.

What I love most about these bars is how effortlessly they come together. The dough doubles as both the crust and the crumble topping, which means you’re only a few simple steps away from a warm, fruit-filled treat that feels like something straight from a bakery case. They’re not overly sweet, beautifully textured, and incredibly versatile — the kind of recipe you can make on a slow weekend morning or whip up for last-minute guests.

Enjoy them with a cup of coffee, pack them into lunch boxes, or serve them warm with vanilla ice cream or a dollop of Greek yogurt. However you choose to enjoy them, these blueberry oatmeal bars are the kind of recipe you’ll find yourself coming back to again and again.

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Why You’ll Love This Recipe

Simple ingredients, big flavor
Pantry staples come together for a bakery-quality dessert that is bursting with fresh blueberry flavor.

Perfect texture 
Soft and jammy in the middle with a buttery oat crumble and base.

Make-ahead friendly
These bars keep beautifully for a few days, making them ideal for meal prep or gifting.

Versatile treat 
Enjoy them as breakfast bars, an afternoon snack, or a cozy dessert.

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Ingredient Notes

Gluten-Free Flour:
This recipe uses a high-quality gluten-free 1:1 flour blend (I love Bob’s Red Mill). Using a blend that already contains xanthan gum helps the crumble hold together beautifully and gives these bars the perfect texture — crisp on the edges and soft in the center.

Almond Flour:
Almond flour adds richness and a delicate, buttery flavor to the crumble layers. It also helps keep the bars tender without feeling heavy.

Rolled Oats:
Use old-fashioned rolled oats for hearty texture — they toast beautifully and give the bars that signature chewy bite.

Blueberries:
Fresh blueberries are the star of this recipe! When simmered with a touch of sugar, lemon zest, and lemon juice, they turn into a bright, jammy filling that’s sweet, tart, and bursting with flavor. You can use frozen blueberries in a pinch — just don’t thaw them first.

Lemon Zest & Juice:
A little lemon enhances the flavor of the blueberries and balances the sweetness of the bars. It gives the filling that fresh, summery taste that makes these bars so special.

Butter:
Melted butter brings everything together, creating that buttery, golden crumble topping and base. It adds richness and helps the oats and flour crisp up beautifully as they bake.

Cinnamon & Vanilla:
Just a hint of cinnamon adds warmth, while vanilla ties everything together and enhances the cozy, homemade flavor of the bars.

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How to Make Gluten-Free Blueberry Oatmeal Bars

(See the recipe card below for the full ingredient list and measurements.)

Step 1: Whisk together the dry ingredients for the crumble topping and base.

Step 2: Combine the melted butter with the vanilla extract and pour over the dry ingredients.

Step 3: Stir together until evenly combined. 

Step 4:  Remove ¾ c of the dry ingredients and place in the refrigerator (this will be the crumble topping).  Press the remaining crumble into the bottom of a parchment lined baking pan.

Step 5: Place the blueberries, lemon zest, lemon juice, sugar, and cornstarch in a saucepan and stir together.

Step 6: Simmer on the stove until thick and jammy.

Step 7: Allow the berries to cool for 5 minutes and then pour over the base and spread to make an even layer.

Step 8: Sprinkle the crumble topping and 1 tbsp of oats over the berries.

Step 9: Bake at 350F on the center rack of the oven until the topping is lightly golden and the berries are bubbling around the edges.

Step 10: Allow the bars to fully cool in the pan before carefully removing them with the parchment paper.  Slice into squares and enjoy!

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Recipe Tips

Line your pan with parchment paper
This makes it easy to lift the bars out in one piece for clean, even slices (and easy cleanup!). Be sure to leave some parchment overhang on the sides for a simple “handle.”

Don’t skip chilling the crumble topping
A quick chill helps the topping bake up crisp and golden, giving you that perfect mix of soft and crumbly textures.

Cook the blueberry filling until jammy
You’ll know it’s ready when it thickens enough to coat the back of a spoon. This ensures the filling stays put between the layers rather than seeping into the base.

Let the bars cool completely before slicing
It’s tempting to dig in early, but cooling allows the layers to set and makes for clean, sturdy slices (worth the wait!).

Store and serve your way
These bars taste wonderful at room temperature, chilled, or even slightly warmed with a scoop of vanilla ice cream. Store leftovers in an airtight container at room temperature for 2–3 days or refrigerate for up to 5 days.

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Photography by Creating Kaitlin

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