-
Preheat oven to 350 degrees. Heat chopped chocolate and butter in a microwave-safe bowl in 20-second increments, stirring between each, until almost melted; do not overheat. Remove; stir until melted and smooth. (Alternatively, place chocolate and butter in a large heatproof bowl set over (not in) a pan of simmering water; stir until melted and smooth) In another bowl, whisk together flour, baking powder and salt.
-
With an electric mixer, beat eggs, brown sugar, and vanilla on high speed until light and fluffy. Reduce speed to low; beat in chocolate mixture. Mix in dry ingredients just until combined. Fold in chocolate chunks.
-
Drop by tablespoons of dough onto baking sheets, 2 to 3 inches apart. Bake, rotating sheets halfway through until cookies are shiny and crackly, yet still soft in centre, 12 to 15 minutes. Cool on sheets 10 minutes; Transfer to wire racks to cool completely.