One-Bowl Pumpkin Cake

For cake:

• 1 ½ cups egg whites aquafaba for vegan option (the liquid from a can of chickpeas)
• 1 ¼ cups confectioner's sugar
• 1 cup all-purpose flour
• 1 ½ tsp cream of tartar
• 1 ½ tsp vanilla extract
• 1 tsp ground cinnamon
• 1 tsp pumpkin pie spice
• ¼ tsp salt
• 1 cup sugar
• 1 cup pumpkin puree

For serving:

• white chocolate optional, use dairy-free chocolate for vegan option
• Whipped Cream optional, use dairy-free brand for vegan option