Heat oven to 350F
Combine butter, cake mix, eggs, blueberries, ⅓ cup white chocolate chips, and pecans
Butter 7x11 inch pan and spread mixture evenly into pan. Bake 30-35 minutes
Let cool then melt remaining white chocolate chips and drizzle over bars
Tip: If melted white chocolate chips are too thick,add a little oil before drizzling