Preheat your oven to 190c
Mix flour, baking soda and salt and set aside.
Using an electric beater, beat butter and sugar until light and fluffy.
Turn the speed down to low and add the egg and vanilla and beat for 1 minute.
Fold in the flour, baking soda and salt with a spatula until just combined.
Stir in the oats, cranberries and white chocolate until evenly distributed.
Chill the dough for half an hour so that it's easier to work with.
Divide into 12 equal portions and place on a lined baking tray. Be sure to space them out.
Bake for 8 - 10 minutes until the tops are golden.
Allow the cookies to cool completely before digging in!