Preheat oven to 350°F. Grease 9x5 loaf pan and line with parchment paper. In a large bowl, whisk together flour, baking powder, baking soda, and salt. Toss cranberries with dry ingredients. In a medium bowl, whisk together brown sugar, oil, white chocolate, egg, vanilla and sour cream until smooth. Add wet ingredients to dry and mix just until combined. Pour batter and spread evenly in baking pan.

Streusel Whisk together flour, brown sugar, and pecans. Add butter pieces and with a pastry blender, crumble mixture together. Sprinkle streusel evenly over bread batter and bake 55-60 minutes. Cool in pan before carefully turning onto a cooling rack to cool completely.