01 -
Heat oven to 180°C / 350°F. Line two large baking trays with baking paper.
02 -
Beat peanut butter, butter and brown sugar until combined and creamy. Beat in egg and vanilla.
03 -
Mix flour, oats, baking soda and salt separately, then fold into the wet mixture. Stir in chocolate chips.
04 -
Divide into 18 balls, about 40 g each, and place well apart on the trays. Flatten each gently to about 1.5 cm thick.
05 -
Bake one tray at a time for 10–13 minutes until the edges are set and lightly golden. Centers should look soft but not wet.
06 -
Leave on the tray for 10 minutes, then transfer to a rack for another 5 minutes. The cookies firm as they cool.
07 -
Store cooled cookies airtight for up to four days, or freeze for up to two months.