Grate the zucchini and let drain in a bowl while preparing the rest of the recipe. You'll need 2 cups shredded zucchini.
Cream together the butter, brown sugar, eggs, and vanilla.
Add in dry ingredients.
Then fold in the 2 cups shredded zucchini and chocolate chips.
Place batter into a 9 x 13 inch baking dish that has been lightly sprayed with non stick cooking spray. Make sure the batter is spread to the edges of the pan.
Bake for 30-35 minutes or until it starts to turn golden brown.
Cool slightly and then slice and serve.
Notes
These bars can be stored in an airtight container for two to three days. You could store them in the refrigerator for longer (5-7 days). IF you want to freeze these bars, wait until they have cooled completely. Place a tight cover on top or transfer to a freezer-safe container. You can store them in the freezer for up to 3 months.