DOUBLE CHOCOLATE BLONDIES + How To Avoid the Most Common Mistakes When Making Them 

Double Chocolate Blondies (yield: 13in x 9in pan)
1.5 c (320g) brown sugar
6 oz (170g) butter, melted
2 tbsp (14g) milk powder, toasted
2 eggs
1 Tbsp vanilla
1.5 c (210g) AP flour
1 tsp baking powder
2 tsp salt
4 oz (113g) milk chocolate, chopped
4 oz (113g) dark chocolate, chopped
1. Combine brown sugar, melted butter, and toasted milk powder.
2. Add the eggs and vanilla and mix until fully incorporated.
3. Add in the flour, baking powder, and salt, mixing just until no dry flour remains.
4. Fold in the chopped chocolate and spread into a 13in x 9in pan or quarter sheet pan lined with parchment paper.
5. Bake at 350F for 18-23 minutes or until golden brown.
Toasted Milk Powder
1. Spread milk powder in a thin layer on a baking sheet lined with parchment.
2. Bake at 300F for 5-10 min or until a light golden color.