Preheat your oven to 350°F (175°C) and grease two 8-inch round cake pans.
Combine the spice cake mix, pumpkin puree, egg whites, water, oil, and vanilla extract in a large bowl.
Mix until smooth. Pour evenly into the two prepared pans.
Bake for 25–30 minutes or until a toothpick inserted in the center comes out clean.
Remove from the oven and let the cakes cool completely on a wire rack.
While the cakes cool, prepare the frosting by adding orange food coloring to vanilla frosting until you achieve a rich orange color.
Stack the two cooled cakes with frosting in the center.
Cover the entire cake with orange frosting using a spatula.
Use green frosting to create a stem at the top of the pumpkin.
Melt chocolate or use chocolate chips to draw a Jack O Lantern face.
Decorate with mini marshmallows for eyes or additional details if you wish.
Serve and enjoy your festive Jack O Lantern Cake!