Preheat oven to 400.

In bowl mix together your dry ingredients and stir to combine.

Add your egg, sour cream, milk, 1 Tbs butter and vanilla extract and stir until just combined.

Fold in your cranberries and white chocolate chips.

Spray your donut pan with non-stick cooking spray and pipe or spoon your donut batter into wells.

Bake for about 10 minutes or until golden and springs back when touched.

Remove from oven and turn out onto cooling rack, let cool until able to handle.

Brush each donut with remaining melted butter and toss in sugar.