Dairy-free:Use meltedcoconut oilinstead of the butter and nondairy Greek yogurt instead of cream cheese in the frosting.
Gluten-free:Use certified gluten-freerolled oats.
Let cakes cool in the pans on a wire rack to ensure that they stay together well.
Discardparchment paperbefore frosting the cakes.
To make ahead, you can bake the cakes up to a day ahead. Let cool, cover completely, and store in the fridge. Allow to sit at room temperature for about 30 minutes before frosting.
Store any leftovers covered with plastic wrap in the fridge for up to 3 days.