Blueberry Pie Bars are a simple gluten-free dessert with a soft oat flour crust and a sweet blueberry filling. They have the flavor of blueberry pie, but in an easier bar form that is great for summer baking, potlucks, or a healthier dessert to keep in the fridge.
A Quick Look at the Recipe
✅ Recipe Name: Blueberry Pie Bars
🕒 Ready In: ~50 minutes
👪 Serves: 9 bars
🍽 Calories: ~280 per bar estimated
🥣 Main Ingredients: Oat flour, butter, honey, blueberries, lemon juice, vanilla extract
📖 Dietary Info: Gluten-free; naturally sweetened
👌 Difficulty: Easy - mix, press, fill, bake
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The filling bakes into a thick, jammy layer with bright lemon flavor, while the crust gives each bar enough structure to slice and serve. They're naturally sweetened with honey, so they still taste like dessert without being overly sweet.
These are perfect when you want something fruity, simple, and easier than pie. If you love gluten-free fruit desserts, try our Gluten-Free Strawberry Shortcake, Strawberry Rhubarb Crisp, or Gluten-Free Lemon Cake next.
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Why You'll Love these Blueberry Pie Bars:
Easier Than Pie: You get the flavor of blueberry pie without rolling out a traditional pie crust.
Sweet Blueberry Filling: The blueberries bake into a thick, jammy layer with just enough lemon to brighten the flavor.
Gluten-Free Crust: Oat flour creates a simple crust that is soft, sturdy, and easy to slice into bars.
Naturally Sweetened: Honey sweetens both the crust and filling without using refined sugar.
Great for Summer: These bars are perfect for potlucks, cookouts, or a simple fruit dessert to keep in the fridge.
Key Ingredients:
- oat flour. This creates the base for the crust and keeps the bars gluten-free. It gives the crust a soft, slightly hearty texture that pairs well with the blueberry filling.
- cold butter. Cold butter helps the crust hold together and gives it a more tender, buttery texture.
- honey. Adds natural sweetness to both the crust and the blueberry filling.
- blueberries. These bake down into a sweet, jammy filling. Fresh blueberries work best, but frozen can be used if needed.
- lemon juice. Brightens the blueberry flavor and keeps the filling from tasting too sweet.
- cornstarch. Helps thicken the blueberry filling so the bars slice cleanly once cooled.
Scroll to the recipe card at the bottom of this page for exact quantities.
Easy Substitutions & Variations:
- Use a different protein: Ground turkey, ground chicken, or Italian sausage can be used instead of ground beef.
- Swap the rice: Brown rice can be used, but it will need a longer cook time and may need extra broth.
- Use a different cheese: Cheddar, Monterey Jack, provolone, or an Italian cheese blend can be used instead of mozzarella.
- Add more vegetables: Mushrooms, zucchini, spinach, or extra bell peppers can be added to make the casserole more vegetable-heavy.
- Make it spicier: Add red pepper flakes, diced jalapeños, or use pepper jack cheese for a little heat.
How to Make Blueberry Pie Bars:
- Step 1: Preheat the oven to 350°F. Line an 8x8 baking dish with parchment paper. Add the oat flour and salt to a large bowl. Cut in the cold butter until the mixture is crumbly.
- Step 2: Stir in the honey and water until the dough comes together. Press the crust mixture evenly into the prepared baking dish.
- Step 3: Add the blueberries, honey, lemon juice, vanilla extract, and cornstarch to a saucepan over medium heat. Cook for 5-7 minutes, stirring often, until the blueberries start to release their juices and the mixture begins to thicken.
- Step 4: Pour the blueberry filling over the crust and spread it evenly. Bake for 30-35 minutes, or until the filling is bubbling and the crust is lightly golden. Let the bars cool completely before slicing. Refrigerate before cutting if you want cleaner slices.
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Recipe Notes & Tips:
- Use cold butter for the crust: Cold butter helps the oat flour crust come together with a tender, slightly crumbly texture.
- Cook the blueberry filling first: Heating the blueberries in a saucepan helps the filling thicken before baking, so the bars slice more cleanly.
- Stir the filling often: Blueberries can stick as they cook, so stir often until they release their juices and the mixture starts to thicken.
- Let the bars cool completely: The filling needs time to set after baking. For cleaner slices, chill the bars before cutting.
- Use certified gluten-free oat flour: Oats are naturally gluten-free, but they can be cross-contaminated, so use certified gluten-free oat flour if needed.
How to Store:
Refrigerator: Store Blueberry Pie Bars in an airtight container in the refrigerator for up to 4 days.
Best Chilled: These bars slice and hold together best when chilled, especially because the blueberry filling needs time to fully set.
Freezer: Freeze the bars in a freezer-safe container for up to 2 months. Place parchment paper between layers so they do not stick together.
Blueberry Pie Bars FAQs:
Yes, frozen blueberries can be used if fresh blueberries are not available. You can cook them straight from frozen in the saucepan, but they may release more liquid and need a few extra minutes to thicken.
Cook the blueberry filling until it starts to thicken, then let the bars cool completely before slicing. Chilling them in the refrigerator before cutting will give you the cleanest slices.
The filling may be runny if it was not cooked long enough in the saucepan, if the blueberries released extra liquid, or if the bars were sliced while still warm. Letting the bars cool and chill helps the filling set.
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Blueberry Pie Bars
Ingredients
- 3 cups oat flour
- 1 teaspoon salt
- ½ cup cold butter
- 3 tablespoons honey
- 3 tablespoons water
- 3 cups blueberries
- ¼ cups honey
- 1 tablespoons lemon juice
- 1 teaspoon vanilla extract
- 2 tablespoons cornstarch
Instructions
- Preheat the oven to 350°F. Line an 8x8 baking dish with parchment paper.
- Add the oat flour and salt to a large bowl. Cut in the cold butter until the mixture is crumbly.
- Stir in the honey and water until the dough comes together.
- Press the crust mixture evenly into the prepared baking dish.
- Add the blueberries, honey, lemon juice, vanilla extract, and cornstarch to a saucepan over medium heat.
- Cook for 5-7 minutes, stirring often, until the blueberries start to release their juices and the mixture begins to thicken.
- Pour the blueberry filling over the crust and spread it evenly.
- Bake for 30-35 minutes, or until the filling is bubbling and the crust is lightly golden.
- Let the bars cool completely before slicing. Refrigerate before cutting if you want cleaner slices.
Nutrition
Notes
- Use cold butter for the crust: Cold butter helps the oat flour crust come together with a tender, slightly crumbly texture.
- Cook the blueberry filling first: Heating the blueberries in a saucepan helps the filling thicken before baking, so the bars slice more cleanly.
- Stir the filling often: Blueberries can stick as they cook, so stir often until they release their juices and the mixture starts to thicken.
- Let the bars cool completely: The filling needs time to set after baking. For cleaner slices, chill the bars before cutting.
- Use certified gluten-free oat flour: Oats are naturally gluten-free, but they can be cross-contaminated, so use certified gluten-free oat flour if needed.
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