INGREDIENTS
1
cup/227 grams unsalted butter, plus more for greasing the pan
1 1/2
cups/330 grams dark brown sugar
2 tsp
vanilla extract
1 tsp
kosher salt
2
large eggs
1 3/4
cups/224 grams all-purpose flour
1/2 tsp
baking powder
Any mix-ins you like (see note)
1/4 tsp
flaky salt (optional)