
These Strawberry Oatmeal Crumble Bars are my answer to that craving for something sweet and wholesome. Each bite brings together the buttery chew of oats with a jammy layer of strawberries topped by a golden, crumbly finish. They disappear fast in my kitchen whether I serve them at breakfast with coffee or pack them up as a weekend treat for friends.
Since my first batch on a rainy Sunday morning these bars have become my go to when the family asks for something special but easy. The strawberry jam shortcut and oatmeal crust make them as foolproof as they are addictive.
Ingredients
- All purpose flour: for structure and tender crumb go for unbleached for best flavor
- Old fashioned rolled oats: bring body and chew look for thick cut oats with no added flavorings
- Unsalted butter: chilled butter makes the crumble flaky splurge on good quality if you can
- Granulated sugar and brown sugar: sweeten and help caramelize layers use fresh brown sugar for deeper flavor
- Baking powder: guarantees a little lift keep it fresh for the best results
- Salt: sharpens other flavors choose fine sea salt for even mixing
- Cinnamon: adds cozy warmth opt for true cinnamon for a sweeter note
- Fresh strawberries: provide juicy brightness test for ripeness by scent and a deep red color
- Lemon juice and zest: heighten the berry flavor always zest before you juice
- Strawberry jam: intensifies the strawberry taste choose a chunky high fruit jam for bonus texture
- Cornstarch: thickens the filling make sure it is lump free before adding
Step by Step Instructions
- Make the Oatmeal Crumble:
- Combine flour oats both kinds of sugar baking powder salt and cinnamon in a large mixing bowl mix well to blend evenly throughout. Cut in the cold diced or grated butter using a pastry cutter or fork until the mix resembles coarse crumbs with some larger butter bits still visible. Chill this mixture in the fridge for at least thirty minutes to keep it tender and easy to press into the crust.
- Cook the Strawberry Filling:
- If using fresh strawberries rinse them carefully and pat dry hull and slice evenly for more consistent texture. In a saucepan combine the strawberries both sugars lemon juice and zest jam and cornstarch. Warm the mixture over medium heat stirring so nothing sticks. Let it bubble then simmer gently about five to seven minutes until it becomes thick and glossy with most of the juices looking syrupy. Let it cool until it is no longer steaming.
- Shape and Parbake the Crust:
- Preheat your oven to three hundred fifty degrees Fahrenheit. Line an eight inch square baking pan with parchment paper for easier removal later. Press about two thirds of the chilled crumble mixture very firmly into the bottom leave no gaps this stops the filling from leaking. Bake for ten to twelve minutes until just set and pale gold.
- Layer and Top:
- Spread the slightly cooled strawberry mixture evenly over your warm crust making sure to reach all corners. Crumble the remaining oat mixture over the top making uneven pebbles for lovely texture.
- Bake to Perfection:
- Bake the bars for thirty to thirty five minutes until the crumb is deeply golden and the filling bubbles up at the edges. Rotate the pan halfway through for even coloring.
- Cool and Cut:
- Let the whole pan cool completely. For extra tidy bars you can chill in the fridge or freezer for fifteen minutes before slicing. Use a sharp knife wiped clean between rows for the neatest bars.

The strawberry jam is honestly my favorite ingredient here. It boosts the berry flavor even if the strawberries are a little lackluster and gives the filling the most delicious sticky sweetness. My kids love helping to swirl in the jam as a special step and it is now a family tradition after berry picking days.
Storage Tips
Keep leftover bars in an airtight container at room temperature for up to two days. Refrigerated they will stay fresh and chewy for five days. If you want to freeze a batch wrap tightly and keep for up to two months. Thaw at room temperature for an hour before serving and the topping stays crisp.
Ingredient Substitutions
You can swap in white whole wheat flour for regular flour with a slightly nuttier taste. Melted coconut oil works if you need dairy free but chill it until firm before mixing it in for that crumbly texture. Raspberry or mixed berry jam makes a fun twist when strawberries are out of season.
Serving Suggestions
Serve these warm with a scoop of vanilla ice cream for dessert or with a dollop of thick Greek yogurt for breakfast. If you like a little zing add extra grated lemon zest just before serving. To jazz them up melt a handful of white chocolate to drizzle after baking for a bakery worthy finish.
Cultural and Historical Tidbits
Crumble bars are rooted in vintage American baking traditions and are especially popular at summer potlucks and church picnics. The oat topping with jammy fruit filling goes back generations partly because oats and preserves were both pantry staples.
Frequently Asked Questions
- → Can I use frozen strawberries?
Yes, thaw frozen strawberries thoroughly and drain excess liquid before using. Add an extra teaspoon of cornstarch to help thicken the filling.
- → How do I achieve a crumbly, not hard topping?
Don't overmix the oat crumble and avoid overbaking. The mixture should hold together when pinched but remain crumbly for the best texture.
- → What can I serve with these bars?
These bars are delicious on their own. For a treat, serve with vanilla ice cream or whipped cream. A drizzle of melted chocolate also pairs well.
- → How should I store these bars?
Store in an airtight container at room temperature for 2 days, refrigerate for up to 5 days, or freeze for up to 2 months.
- → How can I make clean slices?
Let the bars cool completely in the pan. For especially neat slices, chill them in the freezer for about 15 minutes before cutting.
- → Can I substitute other fruits?
Yes, try raspberries, blueberries, or a mix of berries in place of strawberries for a tasty variation of the bars.