If you are using rapid rise yeast, place one third of the flour in your mixer bowl. Add oil, eggs sugar warm water and yeast, Add the rest of the flour, then the salt. The trick is the salt should not be mixed directly with the yeast. 

Using your dough hook, mix until well blended and looks like dough. Then mix on higher speed to knead.

Oil a large bowl and take the dough and shape into a ball and place in oiled bowl. Cover with wet dish cloth or plastic bag. Let rise one and a half to two hours, until double in size.

Braid into challahs. Place on greased pans and let rise another hour. 

Brush on eggwash and sprinkle on sesame seeds. Bake in an oven preheated at 350 degrees Fahrenheit for 35–45 minutes, depending on how big the challahs are. When ready, place on wire rack to cool. Enjoy!!