1.) Preheat your oven to 190°C / 170°C fan. Line your baking trays with parchment, and set aside for later.
2.) Using an electric whisk, beat the butter, sugars, and peanut butter together until light and fluffy. Keep mixing for around 5 minutes - the fluffier, the better!
3.) Add in the egg and vanilla and mix until fully combined.
4.) Stir in the flour and salt until just combined, then fold in the white chocolate pieces.
5.) Shape the dough into equal-sized balls - a small ice cream scoop is handy for making perfectly even portions. Place them on the lined baking tray, leaving a little space around each cookie to let them spread as they bake.
6.) Bake in the oven for 10–12 minutes - they’ll still look soft in the middle, but that’s perfect! Let them cool on the tray for 5 minutes, then transfer to a wire rack to cool completely.
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