ingredients 6 tbsp ( 3/4 stick) unsalted butter chopped 2 c semisweet chocolate chips 3 lg eggs 1/2 c granulated sugar 2 tsp pure vanilla extract 1/2 c plus 2 tablespoons all-purpose flour 2 tbsp unsweetened cocoa powder 1/4 tsp baking soda 1/4 tsp kosher salt canola oil