Step 1

Preheat the oven to 325°F/163°C (with the fan or convection setting turned off)

Step 2

Grease and line an 8-inch square baking pan.

Step 3

Melt the butter in a pan over medium-low heat. Add the brown sugar, syrup, vanilla and cook until the sugar is dissolved and fluid. Remove from heat and whisk until there is no visible melted butter and the mixture resembles melted caramel.

Step 4

Add the oats and mix until well coated.

Step 5

Spread into the prepared pan and press evenly with the back of a spoon or spatula.

Step 6

Bake until they start to firm. This will take 20–30 minutes, use the shorter cooking time for more chewy flapjacks and longer if you prefer them crisper. The flapjacks will firm and crisp more as they cool.

Step 7

Store covered at room temperature for up to 3 days.