Instructions: 1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Prepare the Cake Batter: In another clean mixing bowl, beat the egg whites until stiff peaks form. Gently fold the beaten egg whites into the cake batter until fully incorporated. Add pink food coloring if desired.
3. Make the Pink Champagne Custard Filling: Return the mixture to the saucepan and cook over medium heat, stirring constantly, until it thickens and coats the back of a spoon, about 5-7 minutes.
4. Prepare the Whipped Cream Frosting: In a large mixing bowl, whip the heavy cream, powdered sugar, and vanilla extract together until stiff peaks form.
5. Assemble the Cake: Place the second layer of cake on top of the custard filling. Spread a generous amount of whipped cream frosting over the top and sides of the cake.
6. Serve: Slice and serve your elegant Pink Champagne Pie Cake and enjoy!