All the Milk Bar sheet cakes are brushed with a soak for added moisture and flavour, but I omitted this step; if you want to do it, brush the bottom cake layer with a mixture of ½ cup whole milk ...

200 g milk chocolate, roughly chopped (about 1½ cups) 70 g unsalted butter ½ cup (120 g) sour cream 1 tsp vanilla extract ½ tsp instant espresso powder, optional ½ tsp kosher salt 2½–3 cups ...

Preheat the oven to 350 degrees Fahrenheit. Butter and flour a sheet pan measuring 12 by 18 by 1 1/2-inch. Make the cake by first creaming together butter and sugar on medium-high speed with an ...