Ingredient:

• 1/4 cup brewed coffee, cooled
• 2 tablespoons baking cocoa
• 1-1/2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup sugar
• 1/4 cup unsalted butter, softened
• 1/4 cup canola oil
• 1 large egg, room temperature
• 1/2 cup buttermilk
• 2 tablespoons green food coloring
• 1 teaspoon vanilla extract
• 1/2 cup (1 stick) unsalted butter, softened
• 1 package (8 ounces) cream cheese, softened
• 1 teaspoon vanilla extract
• 1/2 teaspoon salt
• 3-1/2 cups confectioners' sugar
• Sprinkles or edible decorations, optional