Raspberry Oat Crumble Bars

Name: Raspberry Oat Crumble Bars
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 16 bars
Cuisine: Baking
Ingredients: 1½ cups (188 g) all-purpose flour; 1½ cups (135 g) rolled oats; ¾ cup (165 g) brown sugar, packed; ¾ cup (170 g) unsalted butter, melted; 1 cup (320 g) raspberry jam; ½ tsp baking powder; ½ tsp fine salt

A buttery oat base and topping around a jammy raspberry middle.

Prep Time15 mins

Cook Time35 mins

Total Time50 mins

Yield16 bars

Before You Start

One buttery oat mixture does double duty as both the base and the crumbly top, with a layer of raspberry jam in between. It comes together in one bowl and is endlessly adaptable to whatever jam you have.

Instructions

1
Heat the oven to 175°C / 350°F and line a 20 cm square tin.
2
Mix the flour, oats, brown sugar, baking powder and salt. Pour in the melted butter and stir to clumpy, damp crumbs.
3
Press two-thirds of the mixture firmly into the tin to make the base.
4
Spread the jam evenly over the base, leaving a small border.
5
Scatter the remaining oat mixture over the jam, squeezing some into clumps as you go.
6
Bake for 32 to 38 minutes until the top is golden. Cool completely in the tin before cutting, so the jam sets.

Ingredients

1½ cups (188 g) all-purpose flour
1½ cups (135 g) rolled oats
¾ cup (165 g) brown sugar, packed
¾ cup (170 g) unsalted butter, melted
1 cup (320 g) raspberry jam
½ tsp baking powder
½ tsp fine salt

Baker's Tip

For the most reliable results, weigh your ingredients with a digital scale. Measuring flour by cups can overpack it and dry out your bake. Tap any ingredient above to convert it.

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💡 Baker's tips

Let them cool fully. Warm jam is runny and the bars will not slice cleanly.
Press the base firmly so it holds together under the jam.

🔀 Make it your own

Use any thick jam: apricot, blackcurrant or fig all work.
Add ½ cup (60 g) chopped nuts or shredded coconut to the topping.

📦 Storing & freezing

Airtight at room temperature for 4 days, or the fridge for a week. They freeze well.

❓ Frequently asked

Can I use fresh raspberries instead of jam?

Jam gives the most reliable set. Fresh fruit adds a lot of water, so if you use it, toss with a spoon of cornflour and a little sugar first.

How many grams is a cup of rolled oats?

About 90 g per US cup, so 1½ cups is roughly 135 g. The rolled oats converter helps if you are scaling the tin size.

Baking in a different unit? Use the cups ↔ grams converter or the recipe scaler to halve or double this recipe.