The Correct spelling is: occasionally
Common misspellings of the word occasionally are:
How do you spell occasionally?. It is not ccasionally or cocasionally or ocacsionally or ocasionally or ocasionaly or ocassionally or ocassionaly or occaionally or occaisonally or occasinally or occasinoally or occasioally or occasioanlly or occasionall or occasionaly or occasionalyl or occasionlaly or occasionlly or occasoinally or occasonally or occassionally or occassionaly or occationally or occsaionally or even occsionally for that matter!
Now and then; from time to time.