Ridiculously soft and fluffy vanilla sponge layered with creamy custard buttercream and a pool of rich custard in the middle!
Step 1: Make custard by heating the milk and sugar in a saucepan over medium heat.
Step 2: Slowly add the warmed milk to egg yolks, then add everything back to the pan and boil.
Step 3: Add all dry ingredients to stand mixer.
Step 4: Add butter to dry ingredients one chunk at a time, mixing in between.
Step 6: Add the eggs and remaining oil, beat until just combined. Bake at 335°F for 30-40 mins.
Step 7: Whip half the custard with butter to make custard buttercream.
Step 8 Fill and decorate with remaining custard and pipe buttercream on top.