01 -
Preheat the oven to 350°F (175°C). Whisk together the flour, baking powder, and kosher salt in a small bowl. Set aside.
02 -
Melt the bittersweet chocolate and butter in a double boiler, whisking until smooth. Alternatively, microwave the butter and chocolate in a glass bowl at 50% power, heating in 1-minute intervals and stirring until fully melted. Allow the mixture to cool to room temperature.
03 -
In a separate bowl, whisk together the eggs, sugar, and vanilla extract until thoroughly combined. Slowly drizzle the egg mixture into the cooled melted chocolate while whisking continuously.
04 -
Stir the flour mixture into the chocolate mixture until smooth. Fold in the chopped walnuts and semi-sweet chocolate chips.
05 -
Scoop rounded tablespoons of dough onto a parchment-lined baking sheet. Bake for 9-10 minutes, until the cookies appear dry on the outside but remain soft and gooey on the inside.
06 -
Let the cookies rest on the baking sheet for 2-3 minutes before transferring to a wire rack to cool completely. Cookies will firm up as they cool.