These Strawberry Oatmeal Crumble Bars are one of those simple desserts that always disappear fast. They have a buttery oat crumble, a sweet layer of strawberry jam, and just the right balance of soft, chewy, and crisp textures. Since they start with pantry staples and a jar of jam, they’re easy to throw together anytime you need a quick dessert, afternoon snack, or something sweet for a weekend get-together. If you enjoy easy fruit bars like these, be sure to try my Raspberry Oatmeal Crumble Bars, too!
Ingredients & Substitutions
- All-purpose flour: Helps create the buttery crumble texture for both the crust and topping. Be sure to spoon and level the flour so the bars stay tender.
- Old-fashioned oats: The oats give the bars their hearty texture and classic oatmeal crumble flavor. Quick oats can work in a pinch, but the topping will be softer and less textured.
- Light brown sugar: Adds sweetness and a subtle caramel flavor that pairs really well with the strawberry jam. Dark brown sugar can be substituted for a slightly deeper flavor.
- Baking soda: Helps lighten the crumble mixture slightly so it bakes up golden instead of dense.
- Kosher salt: Balances the sweetness and enhances the buttery oat flavor.
- Unsalted butter: Melted butter helps bind the crumble mixture together while creating crisp, golden edges. If using salted butter, reduce the added salt slightly.
- Strawberry jam: The filling that brings all the sweet strawberry flavor. I like using a thicker jam for the cleanest layers, but preserves or homemade strawberry jam work well too. You can also swap in raspberry, blackberry, or mixed berry jam for an easy variation.
FAQs
Can I make these oatmeal crumble bars in a 9×13-inch pan?
Yes! You can double the recipe and bake it in a 9×13-inch pan. The layers will be a bit thinner, so start checking a few minutes early. You’re looking for a lightly golden crumble topping and jam that looks bubbly around the edges.
Can I use fresh strawberries instead of jam?
Not as-is. Fresh strawberries release too much liquid while baking, which can make the bars runny and prevent them from setting properly. If you want to use fresh berries, it’s best to cook them down first into a thick compote or quick jam-style filling so they behave more like preserves in the oven.
Can I use different flavors of jam?
Yes! Strawberry is classic, but this recipe works really well with other jams, too. Raspberry, blackberry, blueberry, or mixed berry all bake up beautifully. Just try to use a thicker jam or preserves so the filling stays nicely layered.
Can I use quick oats instead of old-fashioned oats?
You can, but the texture will be softer and less chewy. Old-fashioned oats give the best structure and that signature crumble topping, so they’re the preferred option if you have them.
How do I keep the bars from falling apart when cutting?
Let them cool completely before slicing. For the cleanest cuts, chill them for about 30 minutes after they’ve cooled to room temperature. A sharp knife also helps you get neat, bakery-style squares.
How to Serve Strawberry Oatmeal Crumble Bars
- Serve slightly warm with a scoop of vanilla ice cream (or your favorite no-churn ice cream recipe) for an easy dessert
- Enjoy chilled for a firmer, chewier texture
- Cut into small squares for coffee or tea time snacks
- Pack into lunchboxes or picnic baskets; they hold up well once cooled
- Add to dessert trays alongside cookies or other fruit bars for variety
How to Store Strawberry Oatmeal Crumble Bars
Room Temperature: Store the bars in an airtight container at room temperature for up to 2 days. They’re best kept in a cool, dry spot so the crumble layer stays nicely textured.
Refrigerator: For longer storage, keep them in the fridge for up to 5 days. The chilled bars will be a little firmer, but still soft and delicious. Let them sit at room temperature for 10 to 15 minutes before serving if you prefer a softer bite.
Freezer: These bars freeze really well. Wrap individual squares tightly in plastic wrap and place in a freezer-safe bag or container. Freeze for up to 2 months. Thaw at room temperature or warm slightly before serving.
Strawberry Oatmeal Crumble Bars
Ingredients
- 1 cup (125 g) all-purpose flour
- 1 cup (90 g) old-fashioned oats
- ½ cup (100 g) light brown sugar, packed
- ¼ teaspoon baking soda
- ⅛ teaspoon kosher salt
- ½ cup (1 stick / 113 g) unsalted butter, melted
- ¾ cup (240 g) strawberry jam
Instructions
- Preheat oven to 350°F. Line an 8×8-inch baking dish with parchment paper, leaving a little overhang on the sides for easy removal.
- In a medium mixing bowl, stir together the flour, oats, brown sugar, baking soda, and salt until evenly combined.
- Pour the melted butter over the oat mixture. Stir with a fork until the mixture is evenly moistened and crumbly with no dry patches remaining.
- Firmly press about two-thirds of the oat mixture into the bottom of the prepared pan to form an even crust.
- Spread the strawberry jam evenly over the crust, leaving a small border around the edges to help prevent bubbling over.
- Sprinkle the remaining oat mixture evenly over the top of the jam layer.
- Bake for 30 to 35 minutes, or until the top is lightly golden brown and the edges are bubbly.
- Let the bars cool completely in the pan before slicing. For cleaner cuts, refrigerate the bars for 30 minutes before serving.
Did you make this recipe?
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