Preheat your oven to 350°F. Grease and line an 8x8 inch baking pan with parchment paper.
In a microwave-safe bowl, melt the butter and the 2 ounces of chocolate together. Stir until smooth.
Stir in the granulated sugar until well combined then add in the eggs one at a time then mix in the vanilla extract.
In a separate bowl, sift together the cocoa powder, all-purpose flour, and salt.
Add the dry ingredients to the wet ingredients, mixing until just combined. Fold in 1 cup of the chocolate chunks.
Pour the batter into the prepared baking pan and spread it evenly and top with the 1/2 cup leftover chocolate chunks.
Bake in the preheated oven for about 25-28 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.
Allow the brownies to cool in the pan before cutting them into squares.