Why these biscuits earn a place in your tin

Sugar-free baking has a reputation for pale, crumbly disappointments, and biscuits are usually the first casualty. Sugar is not only sweetness: it encourages browning, holds moisture and gives a biscuit its snap. Remove it without a plan and you end up with something that tastes of dust. Oats and raisins are the plan here. Rolled oats bring a nutty, substantial bite, while plump raisins — soaked first, so they stay juicy rather than turning into hard little pebbles — deliver sweetness exactly where you want it. The result is chewy in the middle, crisp at the edges, and sturdy enough to survive a rucksack.

What you need

This makes around sixteen biscuits. Everything is measured in grams, because sugar-free doughs are less forgiving than their sugary cousins.

• 150g rolled oats — porridge oats work well; jumbo oats give a chewier bite.
• 100g plain flour — wholemeal adds a gentle nuttiness.
• 1 tsp baking powder and a good pinch of fine salt.
• 1 tsp ground cinnamon — optional, but it makes raisins taste sweeter than they are.
• 80g unsalted butter, melted and cooled, or 60ml mild olive or rapeseed oil.
• 1 large ripe banana, mashed (about 120g), or 100g unsweetened apple purée.
• 1 large egg, beaten.
• 1 tsp vanilla extract.
• 100g raisins, soaked in hot water for ten minutes.
• 40g granulated sweetener — an erythritol-based blend behaves most like sugar.
• 2–3 tbsp milk, only if the dough needs loosening.

How to make them

• Heat the oven to 180°C (160°C fan, gas mark 4) and line two baking trays with baking parchment.
• Drain the raisins and pat them dry. Wet raisins steam and make the biscuits soggy.
• Stir the oats, flour, baking powder, salt, cinnamon and sweetener together in a large bowl.
• In a second bowl, whisk the melted butter or oil with the mashed banana, egg and vanilla.
• Fold the wet mixture into the dry with a spatula, stopping as soon as no dry patches remain. Overworking develops gluten and gives you tough biscuits. Fold in the raisins last.
• Add milk a tablespoon at a time if the dough feels dry. It should be thick and slightly sticky, not pourable.
• Chill the bowl for twenty minutes to firm the mixture and hydrate the oats.
• Scoop heaped tablespoons onto the trays, spacing them 5cm apart, and press each one to about 1cm thick with the back of a fork.
• Bake for 12–15 minutes, until the edges are golden and the centres still look a touch soft.
• Leave on the tray for ten minutes, then transfer to a wire rack.

Getting the texture right

Two things make or break these biscuits. The first is chilling: warm dough spreads into one thin sheet. The second is restraint at the oven door. Pull them out while the middles still look underdone — a fully browned biscuit straight from the oven will be rock hard by teatime. For a crisper biscuit, flatten them to 5mm and bake two minutes longer. For a softer, flapjack-like bite, keep them thicker and store them in the tin with a slice of apple for the first day. Resist adding extra sweetener, too: beyond about 50g, erythritol blends leave a cooling aftertaste and a slightly chalky crumb.

Sweetener choices and sensible swaps

Not all sugar-free sweeteners act alike. Erythritol-based granulated blends measure roughly like sugar and brown reasonably well, which makes them the safest starting point. Stevia-only powders are far sweeter, so use about half the stated amount and taste the raw dough. Date purée and mashed banana sweeten gently but add moisture, so cut back on the milk. A word of caution: xylitol is highly toxic to dogs, even in tiny amounts, so keep the biscuits, crumbs and bowl well away from pets if you use it. And be honest about the label — raisins are naturally high in sugar, making these low-sugar rather than strictly sugar-free. For a truly sugar-free version, swap the raisins for chopped walnuts.

Storing, freezing and lunchbox notes

Cooled biscuits keep in an airtight tin for four to five days, with a layer of baking parchment between them to stop them sticking. They freeze well for up to three months: freeze the raw scooped dough balls on a tray, bag them, then bake from frozen with three or four extra minutes. For lunchboxes they are ideal — no icing to melt, no chocolate to smear, and enough oats to keep anyone going until home time. Leave out any nuts to keep them school-friendly, and check your oats and flour are certified gluten-free if that matters in your kitchen.