Apple Tea Cakes

These were a hit at my sister's Passover dinner:

4 large eggs
6 tablespoons vegetable oil
1 cup sugar
1 cup unsalted matzo meal
3 tablespoons potato starch
1/8 teaspoon salt
1 medium Granny Smith apple, peeled, cored, and diced
sugar to sprinkle on top

Preheat the oven to 350 degrees F.
In a medium mixing bowl, whisk together the eggs and oil. Add the sugar, matzo, potato starch, and salt and mix until blended. Stir in the apples.
Put paper muffin cups into a muffin tin (or spray with non-stick spray). If you don't use the muffin cups, you will have a much harder time getting these out of the muffin tin. Fill 3/4 full with the batter and sprinkle with sugar.
Bake until the tops spring back when pressed, about 15 to 18 minutes.
Cool on a rack and remove from the tin when they are at room temperature.
(courtesy of foodnetwork.com)