Ingreadient

• 9 tablespoons butter, softened
• 1/3 cup sugar
• 1 cup molasses
• 1 large egg, room temperature
• 2-1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon ground ginger
• 1 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 3/4 cup water
• 1 cup packed brown sugar
• 1 tablespoon cornstarch
• 1 cup cold water
• 1/4 cup butter, cubed
• 1 teaspoon vanilla extract
• whipped cream, optional