1 9x9 or 8x8 square pan or 1 9" or 10" round cake pan (I use a flexible silicone pan and it's perfect; if you're using a metal pan I would recommend lining it with parchment or foil)
hand or stand mixer
measuring spoons and cups
Baking spray or vegetable oil
2 T confectioners sugar (optional, for coating pan)
1 tsp cinnamon
2 T sugar
3/4 C sugar
1 tsp lemon juice
1/4 C potato starch
1/2 C matzo meal or matzo cake meal
Preheat oven to 350F. Spray or pour the oil in the baking pan. Sprinkle in the confectioners sugar if using and shake it around the pan to coat it (it won't spread as well as flour or year-round confectioners sugar would, but it'll be good enough).
Slice the apples thinly and lay the slices in the pan. Sprinkle them with the cinnamon and 2 T sugar.
Beat the eggs for 5-10 minutes, until they've gotten light in color and at least doubled in volume. Then add in the other ingredients and mix for about 1 minute. Pour the batter into the pan over the apples
Bake for 40-45 minutes until lightly brown and well-set. Cool in the pan on a rack. When it's cool, you can invert it for an upside down cake or just serve it right out of the pan.
I wanted to add a photo, but the kids seriously ate the whole first cake and fought over the last slice. I have the second cake in the oven, and I'll add a photo when I can!