Preheat oven to 170c fan. Grease and line a 10.5 inch (27cm) x 7 inch (17.5cm) x 1 tray bake tin or similar with baking parchment or greaseproof paper. Please note. If you use a tin with a different size, the baking times may differ.
Using an electric mixer, beat together the butter and sugar until soft, light and fluffy. This will only take a couple of mins.
Sift in the flour and baking powder. Add the Vanilla Extract, oats, cherries and white chocolate chips. Mix together until well combined and forms a dough. This will only take a few seconds when using the electric mixer. Do not over beat.
Press the dough into the prepared baking pan making sure the level is even.
Bake in the oven for 30 mins or until lightly golden. Testing the centre of the bake with a skewer until it comes out clean.
Take out of the oven and dust with caster sugar. Leave in the tin to cool a little, before turning out and cool completely before cutting ut into bars or slices.