Best Zucchini Muffins with Chocolate Chips

Ingredients

• 2 cups all-purpose flour, spooned into measuring cup and leveled-off
• ½ teaspoon baking soda
• ½ teaspoon baking powder
• ½ teaspoon salt
• 2 teaspoons ground cinnamon
• ¼ teaspoon ground nutmeg
• 1 stick (½ cup) unsalted butter, melted
• 1 cup packed light brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 medium (9 oz) zucchini, grated (about 2 packed cups/no need to wring dry)
• ½ cup plus 2 tablespoons chocolate chips
• ⅔ cup chopped pecans or walnuts (optional)