There are so many vegan vanilla and chocolate cake recipes around (find some of mine here, here and here), but I haven't seen nearly as many white chocolate cake recipes. Moreover, I haven't spotted many that have a rich, glossy, chocolate glaze that's made without gelatin.
The search is over!
My White Chocolate Cake with Chocolate Mirror Glaze is a messy endeavour, but the cake most certainly makes up for the clean-up. The glaze takes a little longer and a requires a little more finesse that a buttercream or ganache, but it takes the presentation and taste to a whole new level. You can also make these as mini cakes or use a cake tin of choice (see below images of two different shapes).
The only ingredient you may need to search for is agar agar, but it's pretty commonly found in most supermarkets and vegan stores.