Preheat the oven to 350 degrees and grease an 8x8 baking pan.
Melt the butter in a mixing bowl. Stir in the sugar until combined.
Add the eggs one at a time, mixing well after each.
Stir in the cocoa powder, flour, vanilla extract, and salt until the batter is smooth.
Fold in the semisweet chocolate chips. Spread the batter evenly in the prepared pan.
Bake for 20 to 25 minutes until a toothpick comes out with moist crumbs. Let the brownies cool completely in the pan.
Melt the white chocolate chips in the microwave in short bursts, stirring until smooth.
Spoon the melted white chocolate into a small zip-top bag, snip a tiny corner, and pipe circles on top of the cooled brownies. Drag a toothpick through the circles to form a web pattern. Cut into squares and serve.