Maple Walnut Cupcakes - Diamond Nuts

Ingredients

• Cake
• 1 cup Diamond of California® chopped walnuts
• 8 tablespoons (1 stick) unsalted butter, softened
• 1 1/3 cups granulated sugar
• 2 1/4 cups cake flour
• 1 tablespoon baking powder
• 1/4 teaspoon salt
• 2 tablespoons pure maple syrup
• 4 egg whites
• 1 1/4 cups milk
• Frosting
• 6 tablespoons unsalted butter
• 6 ounces cream cheese, softened
• 2 1/2 cups powdered sugar
• 1/4 cup pure maple syrup
• 1/2 tablespoon vanilla extract