Moist Carrot Bars with Frosting

Ingredients

• 1 1/2 teaspoons baking powder
• 1/2 teaspoon ground ginger
• 1 teaspoon ground cinnamon
• 1/2 teaspoon salt
• 1/2 teaspoon ground nutmeg
• 2 cups grated carrots
• 1/2 teaspoon baking soda
• 1/2 cup brown sugar
• 1/2 cup crushed pineapple, strained
• 3 large eggs
• 2 cups all-purpose flour
• 1 cup white sugar
• 1/2 cup butter, softened
• 1 teaspoon vanilla extract
• 1/2 cup chopped walnuts (optional)
• 1/4 cup softened butter
• 2 cups powdered sugar
• 8 oz softened cream cheese