01 -
Preheat the oven to 350°F (175°C). Cut 4 pieces of parchment paper, overhanging an inverted 18" by 13" baking sheet.
02 -
Beat the eggs and honey for 2 minutes. Add the baking soda dissolved in 1 tablespoon vinegar and flour. Mix well.
03 -
Spread 1/2 cup of the sponge cake batter onto an inverted baking sheet covered with parchment paper. Spread the mixture as thin as possible, reaching the corners of the baking sheet. Bake each layer for 7 minutes (makes 4 layers total).
04 -
Cool completely, then peel off the parchment paper and cut out 2 circles from each cake layer using a 7-8" plate (makes 8 round cake layers total). Reserve all the scraps.
05 -
Place the scrap pieces into a baking sheet and bake for 5-8 minutes at 275°F (135°C) for the crumbs to dry out. Transfer to a zip-lock bag and crush the crumbs finely.
06 -
Mix together the Cool Whip and sour cream. Spread over each layer and frost the sides and top.
07 -
Garnish the cake with crumbs and refrigerate overnight or at least 1 hour before serving.