1hr · 5 servings 1 1/2 cups butter, softened 3 cups firmly packed light brown sugar 6 eggs 3 cups all-purpose flour 1/2 teaspoon baking powder 1/2 teaspoon salt 1 cup whipping cream 1 teaspoon vanilla extract For the icing: 1/2 cup firmly packed light brown sugar 1/4 cup butter 1/4 cup whipping cream 1/2 teaspoon vanilla extract 1/2 cup powdered sugar