In a bowl, beat the egg. Pour kefir there and beat with a whisk. Add baking powder, bran, corn flour and zest. Stir well. Pour into a mold and send in a preheated oven to 180 degrees for 15-20 minutes.
Prepare the cheese layer. Cut the pumpkin into pieces and send in the microwave until soft. Beat egg and egg white in a bowl and beat until foamy, add baked pumpkin, cheese, zest and sweet stevia GREEN LEAF. Mix everything in a blender until smooth. Pour it on a baked cake and bake for another 40-45 minutes until the cheese layer sets. The finished cake can be decorated with slices of orange and nuts.