preheat oven to 325F
mix together 1 cup granulated sugar + 1/2 cup browned butter (heat butter over low/med heat, whisking occasionally to prevent burning, until browned.. about 5 min) + 1 tsp vanilla
whisk in 2 eggs just until combined
add in 3/4 cup all purpose flour + 1/2 cup powdered sugar + 2/3 cup cacao powder
stir in 1 tbsp water or milk
optional: fold in 1/2 cup dark chocolate chips
pour into lined 8×8 dish and bake for 45 min