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've.
Everything you need
- 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
Weigh, don't scoop. Measuring flour by cups can overpack it and dry out your bake. Tap any ingredient to open its converter.
Method
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Heat the oven to 175°C / 350°F and line a 20 cm square tin.
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Mix the flour, oats, brown sugar, baking powder and salt. Pour in the melted butter and stir to clumpy, damp crumbs.
For this step
- 1½ cups (188 g) all-purpose flour
- 1½ cups (135 g) rolled oats
- ¾ cup (165 g) brown sugar
- ¾ cup (170 g) unsalted butter
- ½ tsp baking powder
- ½ tsp fine salt
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Press two-thirds of the mixture firmly into the tin to make the base.
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Spread the jam evenly over the base, leaving a small border.
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Scatter the remaining oat mixture over the jam, squeezing some into clumps as you go.
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Bake for 32 to 38 minutes until the top is golden. Cool completely in the tin before cutting, so the jam sets.
Baker's tips
- Let them cool fully. Warm jam is runny and the bars won't 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're scaling the tin size.
Baking in a different unit? Use the cups ↔ grams converter or the recipe scaler to halve or double this recipe.
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A note on cooking safely. Recipes are provided for informational purposes only and are not medical or nutritional advice. Cooking times, temperatures and quantities are suggestions: use your own judgement, and check that meat, poultry, fish and eggs are properly cooked before serving.
Consult a qualified healthcare professional before making dietary changes, particularly if you have allergies, a medical condition or specific nutritional requirements.