One-Hour Blueberry Crumb Bars with Oat Topping
Soft blueberry filling nestled between buttery shortbread crust and a crunchy oat crumb topping, ready in just one hour. This american-inspired desserts ready in about 60 minutes layers all-purpose flour, rolled oats, packed brown sugar into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 290 calories and feeds 12, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 2 cups all-purpose flour
- 1 cup rolled oats
- 3/4 cup, packed brown sugar
- 1 cup (2 sticks), cold and cubed unsalted butter
- 1 tsp baking powder
- 1/4 tsp salt
- 3 cups fresh blueberries
- 1/2 cup granulated sugar
- 2 tbsp cornstarch
- 1 tbsp lemon juice
Instructions
- Step 1: Preheat oven to 375°F. In a large bowl, combine 2 cups all-purpose flour, 1 cup rolled oats, 3/4 cup packed brown sugar, 1 tsp baking powder, and 1/4 tsp salt. Add 1 cup cold cubed unsalted butter and use a pastry cutter or your fingers to mix until mixture resembles coarse crumbs.
- Step 2: Press about two-thirds of the crumb mixture evenly into the bottom of a greased 9x13-inch baking pan to form the crust.
- Step 3: In another bowl, gently toss 3 cups fresh blueberries with 1/2 cup granulated sugar, 2 tbsp cornstarch, and 1 tbsp lemon juice until berries are coated.
- Step 4: Spread the blueberry mixture evenly over the crust. Sprinkle the remaining crumb mixture over the blueberries to form the topping.
- Step 5: Bake for 40-45 minutes until the topping is golden and the blueberry filling is bubbling around the edges. Allow bars to cool completely before slicing into 12 squares.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does One-Hour Blueberry Crumb Bars with Oat Topping take to make?
Total time is about 60 minutes (15 min prep + 45 min cook). Most home bakers find this fits a weekend afternoon; chill or store as the recipe directs before serving.
How do I store leftover One-Hour Blueberry Crumb Bars with Oat Topping?
Cool fully before storing. Most baked desserts keep at room temperature in an airtight container for 2–3 days, or in the fridge for up to 5 days. Cream- or custard-based desserts must go in the fridge within 2 hours; reheat gently or serve cold per the recipe.
Can I substitute ingredients in One-Hour Blueberry Crumb Bars with Oat Topping?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale One-Hour Blueberry Crumb Bars with Oat Topping for a different number of people?
The recipe is written for 12 servings. Multiply each ingredient by (your serving target / 12). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with One-Hour Blueberry Crumb Bars with Oat Topping?
American desserts like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
