- 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