I looked through recipes and settled on this "Best White Cake Recipe." The recipe was easy to follow and made a nice batter. For my three mini springform pans, I made up half a recipe. I had a decent amount of batter leftover and filled 7 square mini cupcakes too. The mini springforms required almost the full amount of time suggested in the recipe. I started checking at 15 minutes, but it needed about 25.
After baking the cakes, I cooled them briefly, then put them in the freezer on a wire rack. My goal was to trim down one layer to be smaller than the bottom layer. The edges did get a bit crunchy as one recipe reviewer mentioned, but it seemed ok. There wasn't any crunchiness on the mini cupcakes.
I used the buttercream recipe at the same site. The directions were very specific and seemed to make up a nice buttercream. It probably helped also that I cut up the butter in small pieces to allow it to warm to room temperature quickly. I only had 6/8 of a stick left, so I cut this recipe basically in half as well.
A little research told me that pearls are one symbol for the 30th anniversary. I still had some pearls leftover from our Frozen themed cupcakes. It seemed to work out for a quick cake, but certainly not my best decorating.
It was nice to find I still have some cute bakery boxes that fortunately fit the tiered mini cake perfectly. We dropped off the cake and a card as a little anniversary surprise.
With the leftovers we sampled the cakes. One tester felt that it is too sweet, everyone else felt it is a fine white/yellow cake.