The spelling of the word "lasson" may seem confusing to some, but it is actually quite simple when broken down phonetically. Using the International Phonetic Alphabet (IPA), "lasson" is spelled /ˈlæsən/. The "a" in the first syllable is pronounced as a short "a" sound, while the "o" in the second syllable is pronounced as a short "uh" sound. The final "n" is pronounced with a short "n" sound. So, the correct way to spell "lasson" is with one "s" and one "n".