I can’t get over how these strawberry crumble bars turn one simple bowl into a bright, jammy summer dessert with buttery oat crumble in every bite. Fresh strawberries make them look bakery-worthy, but they’re secretly so easy.

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I’m obsessed with these Strawberry Oatmeal Crumble Bars because they hit that sweet-tart spot I crave the second berries start looking good. I get juicy fresh strawberries in every bite, tucked under a buttery, crumbly top with old fashioned rolled oats that keep things chewy in the best way.

And the crust-to-filling ratio? Exactly what I want.

Not fussy. Not precious.

Just bright, jammy, slightly crisp, and way too easy to keep slicing “one more” square. But I fully support that kind of behavior.

A spring and summer dessert I make on repeat, no apologies. Every single time, for real.

Ingredients

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Rolled oats give the bars that cozy chew and a little rustic crunch.
All purpose flour holds everything together so it doesn’t crumble into total chaos.
Brown sugar adds warm, caramel-like sweetness that makes the topping taste bakery-level.
Granulated sugar keeps the crumble sweet and helps the strawberries get glossy.
Baking powder gives the crust a tiny lift, so it’s not too dense.
Salt keeps the sweetness in check.
Basically, it makes everything taste better.
Cold butter creates those crumbly, golden bits you’ll definitely pick off the pan.
Vanilla adds that soft, sweet background flavor that makes it feel homemade.
Fresh strawberries bring juicy, bright flavor and make the filling taste like summer.
Cornstarch thickens the berry juices so the bars slice without being soupy.
Lemon juice adds a fresh little zing.
Plus, it balances all that sweetness.

Ingredient Quantities

1 1/2 cups old fashioned rolled oats

1 1/2 cups all purpose flour

1/2 cup packed light brown sugar

1/4 cup granulated sugar

1 teaspoon baking powder

1/4 teaspoon salt

3/4 cup cold unsalted butter, cut into cubes

1 teaspoon vanilla extract

4 cups fresh strawberries, hulled and roughly chopped

1/3 cup granulated sugar (for the filling)

2 tablespoons cornstarch

1 tablespoon fresh lemon juice

Pinch of salt for the filling

How to Make this

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1. Preheat oven to 350°F and line an 8×8 inch baking pan with parchment, leaving an overhang for easy removal.

2. In a large bowl combine 1 1/2 cups rolled oats, 1 1/2 cups all purpose flour, 1/2 cup packed light brown sugar, 1/4 cup granulated sugar, 1 teaspoon baking powder and 1/4 teaspoon salt.

3. Add 3/4 cup cold unsalted butter cut into cubes and 1 teaspoon vanilla extract to the dry mixture; use a pastry cutter or your fingers to work the butter in until mixture resembles coarse crumbs with some pea sized bits remaining.

4. Reserve about 1 1/2 cups of the oat crumble for the topping, then press the remaining mixture evenly into the prepared pan to form the crust. Chill the pan in the refrigerator while you make the filling, about 10 minutes.

5. In a medium bowl toss 4 cups chopped fresh strawberries with 1/3 cup granulated sugar, 2 tablespoons cornstarch, 1 tablespoon fresh lemon juice and a pinch of salt until the fruit is evenly coated.

6. Spread the strawberry filling evenly over the chilled crust.

7. Sprinkle the reserved oat crumble evenly over the strawberries to form the topping.

8. Bake at 350°F for 25 to 30 minutes or until the topping is golden and the filling is bubbling at the edges.

9. Cool the bars completely in the pan on a wire rack; for clean slices chill in the refrigerator for at least 1 hour to set the filling.

10. Use the parchment overhang to lift the slab from the pan, cut into bars and serve.

Equipment Needed

1. Oven
2. 8×8 inch baking pan lined with parchment paper
3. Mixing bowls, large and medium
4. Measuring cups and measuring spoons
5. Pastry cutter or your fingers for cutting in butter
6. Rubber spatula or spoon for spreading filling
7. Cutting board and knife for chopping strawberries
8. Wire rack for cooling and a refrigerator for chilling

FAQ

Can I use frozen strawberries instead of fresh? Yes. Thaw and drain excess liquid, then pat dry before using; you may need to cook the filling briefly to reduce extra moisture so bars do not become soggy.

Can I make this gluten free? Yes. Substitute a 1:1 gluten free all purpose flour blend for the flour and ensure your oats are labeled gluten free.

How should I store the bars and how long do they keep? Store in an airtight container at room temperature for up to 2 days, in the refrigerator for up to 5 days. Rewarm briefly in a low oven for best texture.

Can I freeze the bars? Yes. Cool completely, cut into squares, then freeze in a single layer on a sheet pan before transferring to a freezer bag for up to 3 months. Thaw in the fridge or at room temperature and warm before serving.

Any tips for a firmer filling? Use the full 2 tablespoons of cornstarch, cook the filling until slightly thickened if using thawed berries, and chill the bars thoroughly before cutting to help set the filling.

Can I swap the butter for a vegan alternative? Yes. Use a firm, chilled vegan butter or coconut oil measured the same. Note texture and flavor may vary slightly; coconut oil can make the topping crumblier.

Strawberry Oatmeal Crumble Bars Recipe Substitutions and Variations

Old fashioned rolled oats: substitute quick oats for a slightly finer texture, or use 1 1/2 cups old fashioned gluten free oats to make the bars gluten free.
All purpose flour: substitute equal amount whole wheat pastry flour for a nuttier flavor and slightly denser crumb, or use a 1:1 gluten free baking blend for a gluten free option.
Cold unsalted butter: substitute chilled coconut oil solidified in the fridge for a hint of coconut and dairy free bars, or use chilled vegan butter for a dairy free swap.
Cornstarch (filling): substitute arrowroot powder in a 1:1 ratio for a clearer, glossy filling, or use tapioca starch at the same amount for a slightly chewier jam-like texture.

Pro Tips

1. Cut the butter extra cold and work it in quickly so you still have pea sized bits. Those little pockets of butter give the crust a tender, slightly crumbly texture instead of turning it into a dense cookie.

2. Pat the crust firmly and chill it before adding the filling. That makes slicing cleaner and helps the bottom stay crisp instead of soggy once the strawberries start releasing juice.

3. If your strawberries are very juicy, toss them with an extra teaspoon of cornstarch. Better to underbake slightly and let them set in the fridge than to overbake until the topping loses its golden color.

4. Let the bars cool completely, then refrigerate for at least an hour before cutting. A sharp knife dipped in hot water and wiped between cuts will make neat slices without dragging the filling.

Strawberry Oatmeal Crumble Bars Recipe

Recipe by Toni Baldesera

0.0 from 0 votes

Servings

servings

Calories

385

kcal

Equipment: 1. Oven
2. 8×8 inch baking pan lined with parchment paper
3. Mixing bowls, large and medium
4. Measuring cups and measuring spoons
5. Pastry cutter or your fingers for cutting in butter
6. Rubber spatula or spoon for spreading filling
7. Cutting board and knife for chopping strawberries
8. Wire rack for cooling and a refrigerator for chilling

Ingredients

1 1/2 cups old fashioned rolled oats
1 1/2 cups all purpose flour
1/2 cup packed light brown sugar
1/4 cup granulated sugar
1 teaspoon baking powder
1/4 teaspoon salt
3/4 cup cold unsalted butter, cut into cubes
1 teaspoon vanilla extract
4 cups fresh strawberries, hulled and roughly chopped
1/3 cup granulated sugar (for the filling)
2 tablespoons cornstarch
1 tablespoon fresh lemon juice
Pinch of salt for the filling

Directions

Preheat oven to 350°F and line an 8×8 inch baking pan with parchment, leaving an overhang for easy removal.
In a large bowl combine 1 1/2 cups rolled oats, 1 1/2 cups all purpose flour, 1/2 cup packed light brown sugar, 1/4 cup granulated sugar, 1 teaspoon baking powder and 1/4 teaspoon salt.
Add 3/4 cup cold unsalted butter cut into cubes and 1 teaspoon vanilla extract to the dry mixture; use a pastry cutter or your fingers to work the butter in until mixture resembles coarse crumbs with some pea sized bits remaining.
Reserve about 1 1/2 cups of the oat crumble for the topping, then press the remaining mixture evenly into the prepared pan to form the crust. Chill the pan in the refrigerator while you make the filling, about 10 minutes.
In a medium bowl toss 4 cups chopped fresh strawberries with 1/3 cup granulated sugar, 2 tablespoons cornstarch, 1 tablespoon fresh lemon juice and a pinch of salt until the fruit is evenly coated.
Spread the strawberry filling evenly over the chilled crust.
Sprinkle the reserved oat crumble evenly over the strawberries to form the topping.
Bake at 350°F for 25 to 30 minutes or until the topping is golden and the filling is bubbling at the edges.
Cool the bars completely in the pan on a wire rack; for clean slices chill in the refrigerator for at least 1 hour to set the filling.
Use the parchment overhang to lift the slab from the pan, cut into bars and serve.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.