Prepare a slow cooker, blender, deep bowl, peel the seeds from the apples and cut into small slices. Wash the rhubarb and remove the thin skin from the stems. Cut the stems into small pieces.
Beat the eggs into a bowl, add sugar and beat well with a blender. Add flour and mix with a spoon. Add vanilla and baking powder, beat again until the mixture is smooth.
Place chopped apples and rhubarb stalks into the dough. Mix well with a spoon. Grease the multicooker bowl with oil. Pour the finished dough with filling into the multicooker bowl and set to “Baking” mode for 60 minutes.
Once the pie has cooled, cut into pieces and, dusted with powdered sugar, serve.