Festive Black Walnut Cake

Ingredients

• 2 teaspoons vanilla extract
• 1 cup unsalted butter, softened
• 1/2 cup unsalted butter, softened
• 8 ounces cream cheese, softened
• 2 cups granulated sugar
• 1/4 cup whole black walnuts
• 4 large eggs
• 1 teaspoon salt
• 2 teaspoons baking soda
• 1 1/2 cups buttermilk
• 1 1/2 cups finely chopped black walnuts
• 4 cups powdered sugar
• 1/3 cup eggnog
• 4 sprigs fresh rosemary
• 3 3/4 cups all-purpose flour
• 1/2 cup sugared cranberries