Here is a step-by-step tutorial on how to make Petit Fours:

1. Bake the cakes as instructed, let them cool, and then cut them into thirds.
2. Spread two of the slices with a thin layer of filling (or fillings!).
3. Stack the layers and top with the final plain cake layer.
4. Cut the cake into 1½” squares and place onto a wax paper-lined baking sheet.
5. Coat each petit four with ganache. The easiest way to do this is to dip the bottom of the petit four, then place on the tines of a fork and pour the ganache over the top with a ladle.
6. Refrigerate the petit fours until the ganache has set. Then repeat process, so each petit four has a double layer.
7. Enjoy your delicious Petit Fours!

I hope this helps! Let me know if you have any other questions or if there's anything else I can help you with.

[Here](https://sugarspunrun.com/petit-fours/) is a link to a recipe that you can follow for more detailed instructions.