Anzac Biscuit Slice: Chewy, Golden Oat Slice

Anzac biscuit slice is a tray-baked Australian and New Zealand treat inspired by the familiar golden oat biscuits, made with rolled oats, coconut, flour, butter and golden syrup. Baking the mixture in one pan makes a chewy-centred slice with crisp edges that is easy to portion for afternoon tea or a lunchbox.

Ingredients

1 cup (90 g) rolled oats
1 cup (75 g) unsweetened desiccated coconut
1 cup (125 g) all-purpose flour
⅔ cup (145 g) packed light brown sugar
½ cup (113 g) unsalted butter, cut into pieces
2 tablespoons (40 g) golden syrup
½ teaspoon baking soda
2 tablespoons (30 ml) boiling water
¼ teaspoon fine salt

Instructions

Heat the oven to 325°F (160°C). Line an 8-inch (20 cm) square baking pan with parchment paper, leaving enough overhang on two sides to lift out the slice. Lightly grease the exposed sides of the pan if needed.
In a large bowl, stir together the oats, coconut, flour, brown sugar and salt. Break up any lumps of sugar so the mixture is evenly combined.
Put the butter and golden syrup in a small saucepan. Warm over low heat, stirring until the butter has melted and the mixture is smooth; do not let it boil. Remove the pan from the heat.
In a small cup, stir the baking soda into the boiling water. It will foam. Pour it into the melted butter mixture and stir briefly. The mixture may bubble up, so use a saucepan with room at the top.
Pour the butter mixture over the dry ingredients. Stir until no dry pockets remain and the oats are evenly coated. The mixture should look crumbly but hold together when pressed. If it seems very dry, press a small handful; avoid adding extra liquid unless the ingredients truly will not bind.
Transfer the mixture to the lined pan. Spread it evenly, then press it down firmly with the back of a spoon or the bottom of a flat measuring cup. Compacting it helps the slice hold together when cut.
Bake for 22–25 minutes, until the surface is evenly golden and the edges are a deeper golden brown. The centre may still feel a little soft; it firms as it cools. If the edges darken quickly, check the pan early, since ovens and pan materials vary.
Set the pan on a wire rack and leave the slice to cool completely in the pan, about 60 minutes. Lift it out by the parchment and cut into 16 squares with a sharp knife. For neat pieces, wipe the blade between cuts.

Tips

Measure flour carefully. Spoon flour into the measuring cup and level it, or weigh it. Scooping directly from the bag can pack in too much flour and make the slice dry or crumbly.
Choose the right syrup. Golden syrup gives the slice its characteristic caramel-like flavour and helps bind the crumbs. If it is unavailable, light corn syrup is a workable substitute, though the flavour will be less buttery and toffee-like; honey works too but tastes more floral and can brown faster.
Press the mixture firmly. An even, compact layer bakes more consistently and is less likely to fall apart. Press right into the corners without making the centre thicker than the edges.
Let it cool before cutting. Cutting while warm can cause crumbling because the butter and syrup have not set. A fully cooled slab is easier to portion cleanly.

Serving Suggestions

Serve the squares at room temperature with tea or coffee, or pack them as a sweet snack for a picnic or lunchbox. They are rich and satisfying on their own, but also pair well with fresh fruit or a small bowl of plain yogurt. For a simple dessert, warm a piece very briefly and serve it with vanilla ice cream; it will be softer and more crumbly than the cooled slice.

Variations

For a slightly less sweet slice, reduce the brown sugar to ½ cup (110 g); expect a less caramel-forward flavour and a somewhat softer result. You can replace up to ¼ cup (25 g) of the coconut with finely chopped almonds or sunflower seeds for extra crunch, keeping the overall dry-ingredient quantity close to the original.

For a chocolate variation, allow the slab to cool completely, then drizzle over 2 ounces (55 g) melted dark chocolate and let it set before cutting. You can also add ⅓ cup (55 g) chopped raisins or dried cranberries to the dry ingredients. These additions make the slice less traditional in flavour and may make the pieces a little more fragile, so press the mixture firmly into the pan.

Storage and Reheating

Once completely cool, store the slice in an airtight container at room temperature for up to 5 days, in a cool, dry place. Keep it away from direct sunlight and moisture; refrigeration is not usually needed and can make the texture firmer. For food safety, refrigerate within 2 hours if the slice is served with a perishable topping such as cream or fresh fruit, and store that topping separately.

To freeze, place the cooled squares in a freezer-safe container with parchment between layers and freeze for up to 2 months. Thaw at room temperature for about 1 hour. The slice is usually best served at room temperature, so reheating is optional; to soften a square, microwave it for about 8–10 seconds, checking carefully, or warm it in a low oven for a few minutes. Avoid overheating, which can make the edges hard.

Frequently Asked Questions

Why is my Anzac biscuit slice crumbly?
It may have been under-pressed, overbaked, or measured with too much flour. Press the mixture firmly into the pan, remove it once the edges are golden, and let it cool completely before cutting. If it is already crumbly, serve the pieces as oat clusters with yogurt or ice cream.

Can I use quick oats instead of rolled oats?
Yes, but the texture will be finer and less chewy. Rolled oats give the slice its characteristic bite, so use them if available. Avoid instant oats that are flavoured or sweetened.

Can I make the slice without coconut?
You can replace the coconut with the same weight of extra rolled oats, but the result will be less fragrant and a little denser. The coconut also absorbs moisture, so press the mixture well and check the bake near the lower end of the time range.

Can I make it gluten-free?
Use a certified gluten-free all-purpose flour blend and certified gluten-free oats. The texture can vary by flour blend, so weigh the flour and press the mixture firmly. Check the bake for golden edges rather than relying only on the clock.

How do I know when the slice is done?
Look for a golden surface and deeper golden edges. The middle can still seem soft when hot, because it firms as it cools. Baking until the whole slab feels hard in the oven often produces a dry slice.

Can I double the recipe?
Yes. Double all ingredients and use a 9-by-13-inch (23-by-33 cm) pan, spreading and pressing the mixture evenly. It may need a few extra minutes, so begin checking at 22 minutes and remove it when the edges are golden. Cool it fully before slicing.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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