Preheat oven to 190°C (170°C fan)/ 375°F (325 °F fan)
In a mixing bowl, cream together the softened butter and caster sugar.
Cream in the golden syrup to mix well.
Add half the jumbo oats, half the plain flour and the baking powder. Mix well to combine.
Add the remaining oats and plain flour and stir again until your mixture comes together in a big ball.
Divide into 18 equal size balls and place onto the baking trays leaving a fair bit of space between each one.
Flatten the biscuit dough balls with your hand or a biscuit press (I use a burger press).
Bake for about 12 - 15 minutes or until the edges start to turn golden brown.
Leave the biscuits on the trays for 5 minutes before moving them to a wire rack. This helps them firm up without breaking.
Store in an airtight container once completely cool.