Double Chocolate Zucchini Muffins

Ingredients

• 1 ½ cups grated zucchini
• 1 ½ cups all-purpose flour (spooned and leveled (about 180g))
• ¼ cup natural unsweetened cocoa powder ((20g))
• 1 ¼ teaspoons baking soda
• ½ teaspoon kosher salt ((such as Diamond Crystal))
• ¼ teaspoon espresso powder ((optional, for extra depth))
• ¾ cup granulated sugar ((150g))
• ½ cup vegetable oil ((120g))
• 1 large egg
• 1 teaspoon pure vanilla extract
• ¾ cup mini semisweet chocolate chips (divided)