Heat oven to 325°F.

Lightly grease and line 3 (8-inch) round cake pans with parchment paper.

Prepare double batch of brownie batter as directed. Divide batter evenly into 3 pans.

Bake 38-40 minutes.

Cool completely before removing from pans.

For Ganache: Place each type of chips into 3 bowls.

Heat cream in microwave at 30 seconds intervals until it just boils.

Immediately pour three-fourths cup cream over each type of chips: stir until chocolate melts.

Add one-fourth cup corn syrup to each, stir until shiny.

Let cool 2 hours before whipping with an electric mixer until fluffy.

Place cooled brownie layer on plate and spread different variety of ganache between each layer. Serve chilled.