I have a cake due for Saturday morning. I generally don't make "simple" cakes like vanilla so leave it to me to be stumped for a recipe. I used one last time but I can't find it. So I need to bake today and I am at a loss as to which recipe to use.

I am making a sandcastle cake so it will be stacked in a few layers and carved a little bit. It will have a Cinnamon-Snickerdoodle buttercream filling and frosting. It will remain inside the venue until time to cut it.

PLEASE HELP!
Thanks in advance! Y'all are always so wonderful!