Preheat the oven to 375 °F. Spray a 9x13-inch casserole dish with nonstick spray.
Grate the zucchini. I like to use the food processor for this because I'm especially injury-prone, but a regular cheese grater also works fine.
Whisk in the egg and egg white until fully beaten
Stir in the sugar, vanilla extract, baking powder, cinnamon and salt
Stir in the milk
Stir in the rolled oats
Stir in the chocolate chips
Put it in the oven and bake for about 45 minutes