preheat the oven to 350˚
melt the butter over medium heat, once melted keep it on the heat until it starts to brown up a bit, this give it a rich nutty flavor
meanwhile mix flour, salt, and baking powder together, set aside
prep your 8X8 pan as well, either butter it generously OR line it with foil or parchment paper
once the butter is browned set it off the heat for a few minutes to cool, you don't want to add the eggs to it while it's too hot and scramble them
measure the brown sugar in a large mixing bowl, add the eggs and stir until combined, it will be thick
add the flour mixture, stir to combine, add the butterscotch chips and chopped pecans and stir again
press into your prepared baking pan
sprinkle lightly with kosher salt if you like that salty sweet combo
bake at 350˚ for 30-35 minutes or until set, they will remain dense and soft while cooking but will firm up as they cool
to cut gently lift out of the pan and cut on a cutting board