Old-Fashioned Molasses Cake

Ingredients

• 2 tablespoons butter, softened
• 1/4 cup sugar
• 1 large egg, room temperature
• 1/2 cup molasses
• 1 cup all-purpose flour
• 1 teaspoon baking soda
• 1/4 teaspoon ground ginger
• 1/4 teaspoon ground cinnamon
• 1/8 teaspoon salt
• 1/2 cup hot water
• Whipped topping, optional