Raspberry Crumble Bars

You know those expensive bakery case crumble bars that look heavily streuseled and perfectly jammy? We are making those at home today. Ready in about 105 minutes, these bars are incredibly forgiving. Most of that time is honestly just letting them chill so you get clean slices. You don't even need to make two separate doughs—the base crust and the oat topping are the exact same mixture. The real trick here is pressing the bottom layer down firmly. It has to be tight to hold up that heavy, wet raspberry filling without turning to mush. A quick hit of fresh lemon juice completely brightens up the berries. It keeps the whole pan tasting tart and fresh, never cloyingly sweet.

1. Prepare the pan

   Preheat the oven to 350°F / 175°C. Line an 8x8-inch baking pan with parchment paper. Leave a little overhang on the sides so you can easily lift the whole block of bars out later. Trust me, it saves you from destroying the first slice trying to dig it out with a spatula.

   

2. Make the crumble mixture

   In a large bowl, mix the flour, oats, sugar, baking powder, and salt. Cut in the cold butter using your hands or a pastry blender until it looks like coarse sand. Mix in the egg yolk and vanilla extract. Keep working it until the mixture starts clumping together slightly when you squeeze a handful of it.

   

3. Press in the base

   Scoop out about 1 cup of this crumble mixture and set it aside—this is your topping. Dump the remaining mixture into your lined baking pan. Press it down aggressively with the bottom of a measuring cup or your hands until it forms a tight, perfectly even crust.

   

4. Make the raspberry filling

   In a separate bowl, toss your fresh or frozen raspberries with the jam, sugar, cornstarch, and lemon juice. Be gentle so you don't completely smash the berries into paste. Spoon this entire fruit mixture in an even layer right over your packed crust.

   

5. Add the topping and bake

   Grab that cup of reserved crumble topping. Sprinkle it heavily over the raspberry layer, squeezing some pieces together to make bigger, crunchy clumps. Bake for 35 to 42 minutes. You want the oat topping visibly golden brown and the berry filling bubbling aggressively around the edges of the pan.

   

6. Cool and slice

   Let the pan cool completely on a wire rack—don't rush this part. Once it's at room temperature, pop the pan in the fridge for 30 to 45 minutes. This sets the jam so you can lift them out, cut them into sharp squares, and dust lightly with powdered sugar.

   

• Parchment paper makes it much easier to lift the bars out of the pan without breaking them—always leave a little extra overhang.
• A short chill in the fridge helps the jammy filling set up hard so the bars cut cleanly instead of falling apart on your cutting board.
• Don't overmix the berries. Gently tossing them helps them keep some texture instead of turning fully into soup before baking.

• Blueberries, blackberries, or a frozen mixed berry blend can easily replace the raspberries.
• Seedless raspberry jam works perfectly if you want a smoother filling texture without the crunch.
• To make these gluten-free, swap in a 1:1 baking blend and make sure your oats are certified gluten-free.

Serving Size

1 bar

Calories

235

Protein

3g

Carbohydrates

33g

Fat

10g

Fiber

3g

Sugar

17g

Sodium

95mg