Veggie Muffins for Kids

Name: Veggie Muffins for Kids
Ingredients: Nonstick cooking spray, for the muffin pans; 1 cup finely grated zucchini (from 1 medium zucchini); 2 cups old-fashioned rolled oats; 2 cups baby spinach; 3/4 cup whole milk; 1/4 cup maple syrup; 2 tablespoons whole-milk Greek yogurt; 1 teaspoon baking soda; 1 teaspoon pure vanilla extract; 1/2 teaspoon ground cinnamon; 1/4 teaspoon ground ginger; 1/4 teaspoon kosher salt; 2 large eggs; 1 ripe banana, sliced (about 1 cup); 1 cup whole wheat flour; Mini chocolate chips, for topping, optional