Very light and not overly sweet. The poppy seeds add delicious texture. This is a good choice for a morning coffee cake, but we also liked it as a dessert, served with whipped cream or vanilla ice cream.
Preheat the oven to 350 degrees F. Grease a 9-inch by 13-inch baking pan.
Beat together the eggs, vanilla, butter, and sugar. Sift together the flour, baking powder, salt, and cinnamon. Add to the egg mixture along with the poppy seeds and blend well. Gently fold in the apples. Pour into the prepared pan.
Bake for 45 to 50 minutes or until a tester inserted near the center comes out clean. Let cool in the pan. Serve warm or completely cooled.