Preheat oven to 375°F and line baking sheets with parchment.
In a large bowl, cream together butter and sugars until fluffy. Beat in egg, vanilla, and zucchini until blended.
12 tablespoons unsalted butter, 1 cup packed brown sugar, ½ cup granulated sugar, 1 large egg, 1 teaspoon pure vanilla extract, 1 cup finely shredded zucchini
In another bowl, mix together flours, baking soda, and salt. Stir into sugar mixture until well incorporated, then mix in chocolate chips.
1 ¾ cups all-purpose flour, ¾ cup whole wheat flour, 1 teaspoon baking soda, 1 teaspoon fine sea salt, 1 cup chocolate chips or chunks
Scoop onto prepared baking sheets and bake for 10-12 minutes, or until golden on the bottom. Let cool a few minutes on the baking sheet, then transfer to a wire rack to cool completely.
Notes
If you don't have whole wheat flour, swap in all-purpose flour for a total quantity of 2 ½ cups.