Chocolate Chip Zucchini Bread

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1/3 cup unsalted butter, melted and cooled slightly

1/3 cup vegetable oil

1 teaspoon vanilla extract

2 large eggs

One 8-ounce zucchini (about 1 large), grated (about 1 1/2 cups)

1 1/2 cups all-purpose flour (see Cook's Note)

1/2 cup packed light brown sugar 

1/2 cup granulated sugar

1/2 teaspoon baking powder

1/2 teaspoon baking soda

1/2 teaspoon kosher salt

3/4 cup semisweet chocolate chips

Canola nonstick cooking spray, for greasing the pan