For the Cake:
1 2/3 cup all-purpose flour 213g
1 1/3 cup granulated sugar 303g
1/4 tsp baking soda heaping
1 tsp baking powder heaping
1/4 tsp kosher salt
3/4 cup brown butter 170g, unsalted, room temperature
1/2 cup sour cream 120ml, room temperature
1/2 cup whole milk 120ml, room temperature or warm
3 egg whites room temperature
1 tbsp vanilla extract nice
1 tbsp vanilla bean paste