Add the yeast, sugar, salt, 1 egg, canola oil and warm water to a bowl and mix. Add the flour gradually, mixing continuously. Knead for 5 minutes.
Oil a medium challah mold and add the dough, cover with a towel soaked with hot water. Add a full cup of water to a microwave and run on high for 2 minutes. Move the cup to the corner of the microwave, add the mold with dough into the microwave and leave to rise for 20 minutes. 3. Place in oven and bake for 18 minutes. Flip the challah onto a baking sheet and brsh with egg wash. Sprinkle generously with sesame seeds. Bake for another 10 minutes.