There are few things as comforting and crave-worthy as a pan of homemade crumble bars. These Blueberry Oatmeal Crumble Bars deliver the perfect blend of juicy fruit, chewy oat layers, and golden-brown crunch. They’re nostalgic but not old-fashioned, and they’re simple enough to throw together without needing a mixer or special tools.
These bars strike that rare balance between indulgent and wholesome. They’re sweet but not cloying, hearty but still dessert-worthy. The base and crumble topping are made from the same dough, a buttery oat mixture that comes together in minutes and doubles as a crisp, golden lid over the bubbling blueberry filling.
We use fresh or frozen blueberries, so you can make these year-round. The filling is simple—just berries, a touch of sugar, lemon juice, and cornstarch to thicken things up as it bakes. The result? A gooey, jammy center with bright blueberry flavor.
Whether you’re packing lunches, serving brunch, or craving a midnight snack, these bars have your back. They travel well, hold their shape, and taste even better the next day.
They’re also easy to customize. Add a little cinnamon to the oat layer, mix in some lemon zest, or swap the blueberries for blackberries or raspberries. But honestly, once you taste the classic version, you might not want to change a thing.
Kids love them. Adults love them. And they happen to be one of the easiest desserts to bake for a crowd. No frosting, no layers, just simple ingredients that yield rich results.
This is comfort food that leans slightly toward the healthy side. Oats add fiber, blueberries bring antioxidants, and the sugar is modest for a dessert. They’re not pretending to be health bars, but they won’t send you into a sugar crash either.
They also freeze beautifully. Make a batch, slice it, and store the extras for grab-and-go treats later. If you’re the planning type, you’ll want these in your rotation for meal prep and bake sales.
Serve them warm with a scoop of vanilla ice cream, or eat them straight from the pan with a fork. Either way, they’re irresistible.
So if you’re looking for a bake that’s cozy, satisfying, and just the right amount of sweet, these bars are it.
Servings: 9-12 bars
Prep Time: 15 minutes
Cook Time: 35 minutes
Total Time: 50 minutes
Ingredients:
For the Oat Crust & Crumble:
- 1 1/2 cups old-fashioned rolled oats
- 1 1/4 cups all-purpose flour
- 1/2 cup brown sugar
- 1/4 teaspoon salt
- 1/2 teaspoon baking soda
- 3/4 cup unsalted butter, melted
For the Blueberry Filling:
- 2 cups fresh or frozen blueberries
- 2 tablespoons granulated sugar
- 1 tablespoon lemon juice
- 1 tablespoon cornstarch
Instructions:
- Preheat oven to 350°F (175°C). Line an 8×8-inch pan with parchment paper.
- In a large bowl, mix oats, flour, brown sugar, salt, and baking soda.
- Stir in melted butter until mixture is crumbly and moist.
- Press about 2/3 of the oat mixture into the bottom of the pan to form an even crust.
- In a separate bowl, toss blueberries with sugar, lemon juice, and cornstarch.
- Spread blueberry filling over the crust evenly.
- Sprinkle remaining oat mixture on top.
- Bake for 35-40 minutes, or until top is golden brown and filling is bubbling.
- Cool completely in the pan before slicing.
Tips:
- For extra crunch, mix in 1/4 cup chopped nuts to the crumble topping.
- Use parchment paper for easy lift-and-slice bars.
- Let cool fully for clean slices (or don’t—they’re amazing warm too).
Why You’ll Love This Recipe:
These bars are soft, chewy, slightly crunchy, and packed with blueberry goodness. They’re easy to make, adaptable, and a guaranteed hit at any table.
Blueberry Oatmeal Crumble Bars are everything you want in a baked treat—sweet, tart, buttery, and satisfying. Make a batch once and they’ll become your go-to for snacking, sharing, and savoring.
