Apple flapjacks are a classic British bake: a chewy oat traybake sweetened with golden syrup and studded with soft, caramelised apple pieces. They sit somewhere between a granola bar and a cookie, with a crisp golden top and a dense, sticky centre. This version uses grated apple, which melts into the oats as it bakes, so every bite is moist and fruity without turning the flapjacks soggy.
Ingredients
- 250 g (2 cups) rolled oats (not instant)
- 125 g (1/2 cup + 1 tbsp) unsalted butter, plus extra for greasing
- 100 g (1/2 cup) light brown sugar
- 3 tbsp golden syrup (or light corn syrup)
- 1 large apple (about 150 g / 5 oz), peeled, cored and grated
- 1/2 tsp ground cinnamon (optional)
- Pinch of salt
Instructions
- Preheat the oven to 180°C (350°F). Grease and line a 20 cm (8 inch) square baking tin with baking parchment, leaving some overhang for easy lifting.
- In a large saucepan, melt the butter, brown sugar and golden syrup together over a low heat, stirring occasionally, until the sugar has dissolved and the mixture is smooth. Remove from the heat.
- Stir in the grated apple, cinnamon (if using) and salt. The mixture will look slightly curdled at this point – that’s fine.
- Add the rolled oats and stir thoroughly until every oat is coated in the butter mixture. The mixture should be quite wet and sticky.
- Tip the mixture into the prepared tin and press it down firmly and evenly with the back of a spoon or a spatula. Make sure the surface is level.
- Bake for 25–30 minutes, until the edges are deep golden brown and the top is lightly browned. The centre will still look slightly soft – that’s expected, as it firms up as it cools.
- Leave the flapjacks to cool completely in the tin. Once cool, lift out using the parchment and cut into 12 squares or bars with a sharp knife.
Tips
- Don’t overbake: The flapjacks will look underdone in the middle when you take them out, but they set as they cool. Overbaking makes them dry and hard.
- Press firmly: The more you compress the mixture into the tin, the less crumbly your flapjacks will be. Use a potato masher or the back of a metal spoon.
- Grate the apple finely: Coarse chunks of apple can create pockets of moisture that make the flapjacks fall apart. A fine grater distributes the apple evenly.
- Use rolled oats, not jumbo or instant: Jumbo oats need longer baking and can be too chewy; instant oats turn to mush. Standard rolled oats give the right texture.
Serving Suggestions
Serve apple flapjacks as an afternoon snack with a cup of tea, or pack them into lunchboxes. They’re also lovely crumbled over vanilla ice cream for a quick dessert, or warmed slightly and served with a dollop of crème fraîche.
Variations
- Add dried fruit: Stir in 50 g (1/3 cup) raisins, sultanas or chopped dried apricots with the oats.
- Nutty flapjacks: Add 50 g (1/3 cup) chopped walnuts or pecans for extra crunch.
- Spiced version: Add 1/2 tsp ground ginger or mixed spice along with the cinnamon.
- Gluten-free: Use certified gluten-free rolled oats. The rest of the ingredients are naturally gluten-free.
- Vegan: Replace the butter with a plant-based block margarine and use a vegan golden syrup (most are). The texture will be slightly softer but still delicious.
Storage and Reheating
Store apple flapjacks in an airtight container at room temperature for up to 5 days. They will firm up as they sit – if you prefer them softer, add a slice of bread to the container; it will release moisture and soften them. You can also freeze them for up to 3 months, wrapped tightly in cling film and foil. Thaw at room temperature for 1–2 hours, or reheat individual flapjacks in the microwave for 10–15 seconds for a warm, gooey treat.
Frequently Asked Questions
Why are my flapjacks crumbly?
This usually happens if you didn’t press the mixture down firmly enough, or if you used too little butter/syrup. Make sure you melt the butter and sugar completely and press the mixture into the tin with real force. Also, don’t cut them until completely cool – they need time to set.
Can I use a different apple?
Yes, any eating apple works. Granny Smith adds a tart note, while Braeburn or Gala give more sweetness. Cooking apples like Bramley will break down more, making the flapjacks softer – you may need to squeeze out some of the grated apple’s juice.
Can I make these without golden syrup?
Golden syrup gives the classic flavour, but you can substitute with honey, maple syrup, or light corn syrup. Honey will make them slightly more floral, and maple syrup adds a woodsy note. The texture will be similar.
How do I know when they’re done?
The edges will be deep golden and pulling away from the tin slightly, and the top will be lightly browned. The centre will still look soft and slightly underdone – that’s normal. If you insert a skewer, it should come out with moist crumbs, not wet batter.
Can I double the recipe?
Yes, use a 23 x 33 cm (9 x 13 inch) tin and increase the baking time by about 5–10 minutes. Check at 30 minutes and add time in 5-minute increments until the edges are golden.
Why did my flapjacks turn out hard?
Overbaking is the most common cause. The sugars caramelise and harden as they cool, so if you bake them too long, they become rock-like. Also, using too much sugar or syrup can make them overly hard once cooled. Stick to the recommended baking time and check early.
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