I guess they're called dessert dishes now and here's a link to a some.
I layered brownie, frosting, brownie, frosting and then added some chocolate sticks on top.
You can assemble this with all store bought ingredients, but I made everything from scratch. I melted chocolate and filled a parchment triangle with the melted chocolate, then piped chocolate lines onto another sheet of parchment. I let the chocolate harden, then topped the trifles as a garnish.