Moist and Delicious Carrot-Zucchini Cake

Ingredients

• 2 cups all-purpose flour
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1/2 teaspoon salt
• 1/4 teaspoon ground nutmeg
• 1/2 cup butter, softened
• 1 1/2 cups white sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 1 cup shredded carrots
• 1 cup shredded zucchini
• 1/2 cup chopped walnuts (optional)