Preheat the oven to 350°F. Line a 9 x 9-inch baking pan with parchment paper on two of the sides to create a sling.

In a saucepan, melt the condensed milk and butter together over medium heat, stirring frequently.

Remove from the heat and add chocolate chips. stir until all of the chocolate chips have melted.

In a cup whisk the brown sugar, eggs and vanilla together and add to the cooled chocolate mixture

Add the flour, cocoa powder, and salt. Stir until just combined. (Do not overbeat the batter)

Pour the prepared batter into the baking dish and Bake the brownies on the top rack for 45-50 minutes

Let cool for 30-40 minutes before using the parchment paper sling to lift the brownies from the pan and then cut into 9 equal pieces