Good-Cooking - Rosemary Apple Cake

Ingredients

• 3 tablespoons butter
• 1/2 cup brown sugar, packed
• 1 tablespoon rum
• 2 to 3 apples (peeled, quartered and cored)
• 1 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 1 1/2 teaspoons fresh rosemary leaves, minced
• 6 tablespoons butter, softened
• 3/4 cup granulated sugar
• 1 whole egg
• 1 egg yolk
• 3/4 teaspoon vanilla extract
• 2/3 cup milk