01 -
Heat your oven to 350°F.
02 -
Combine chocolate and butter, heat in microwave with 30-second bursts until fully melted.
03 -
Beat together sugars, eggs, and vanilla. Add the melted chocolate mixture.
04 -
Add flour and salt to bowl. Toss in walnuts if you want them.
05 -
Empty mixture into shell, cook for 25-30 minutes until sides firm up but middle stays gooey.
06 -
Set on wire rack to cool before cutting.