Chocolate Zucchini Cupcakes

1/2 cup (1 stick) butter, melted and cooled slightly

1/2 cup vegetable oil

3 eggs

2 teaspoons vanilla

1/2 cup buttermilk

2 cups grated unpeeled zucchini

2 medium zukes

1 cup chocolate chips

2 cups flour

1 cup unsweetened cocoa powder

2 teaspoons kosher salt (or half as much table salt)

2 teaspoons baking soda

1/4 teaspoon ground cloves

1 teaspoon cinnamon

1 cup chopped walnuts, toasted at

350 for 5 minutes (optional, of course)

Powdered sugar for topping (also optional)