Frosted Pistachio Bars

Ingredients

• 2 cups all-purpose flour
• 2 packages (3.4 ounces each) instant pistachio pudding mix
• 1/2 cup sugar
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1 large egg
• 1/2 cup canola oil
• 1/4 cup water
• 1 teaspoon vanilla extract
• 1/2 cup chopped pistachios, optional
• 3 ounces cream cheese, softened
• 1/4 cup butter, softened
• 1 teaspoon vanilla extract
• 1/8 teaspoon salt
• 3 cups confectioners' sugar
• Optional decorations: candy eyeballs, M&M's minis, milk chocolate M&M's, Life Savers hard candies and gummies, regular and mini peanut butter cups, licorice twists, shoestring licorice, Starburst fruit chews, mega and regular Smarties, Nerds, Runts, Snaps chewy candies, candy corn, tiny-size Chiclets gum, butterscotch hard candies, Rolo candies, Caramel Creams and PayDay candy bar