Mix flour, BP, salt, vanilla sugar in a bowl

Cream sugar and eggs until creamy and pale, then stir in oil.

Add in dry ingredients a little at a time, alternating with milk.

Pour and spread half of the batter onto baking pan

Add cocoa powder to the remaining batter, mix well, the spread onto pan

Spoon cherry pie filling on top chocolate batter

Bake on preheated 350 F until knife inserted comes out clean (with the cherry filling it may be tricky to check, you can poke your knife on sides instead center of cake)

Mix custard powder with milk, set to side

Bring milk and sugar to simmer, then stir in custard mixture, stir til thickened and creamy

Take off from heat, cover with cling wrap in the custard, and let it cool completely to room temperature

Cream butter then mix in custard a little at a time, until creamy

Spread cream on the cake, chill an hour or two, or overnight

Over double boiler, melt Nutella along with oil, and chocolate, pour glaze over cake. Chill a couple of hours or overnight before serving

Take out from the fridge, let stand at least 30mins or so, slice and enjoy