Preheat oven to 350 degrees
Line a 9x9 pan with parchment & spray lightly with cooking spray
In a large, microwave-safe bowl, melt butter & allow to cool to room temperature
Add in brown sugar, McCormick Pure Vanilla Extract & egg - mix well until smooth
Stir in flour, baking powder, salt, baking soda & McCormick Ground Cinnamon
Fold in 3/4 cup of the semi-sweet chocolate chips
Transfer batter to prepared pan & spread out
Dust the top with 1 tbsp of the McCormick Ground Cinnamon/sugar mixture
Bake 20-25 minutes
Remove & immediately sprinkle with 1 more tbsp of the McCormick Ground Cinnamon/sugar mix, remaining semi-sweet chocolate chips & white chocolate chips
Once bars are just slightly warm, sprinkle with final tbsp of the McCormick Ground Cinnamon/sugar mix
Allow to continue cooling before cutting