French · Pronunciation Guide
A nasal "boh" — one syllable, rounded lips, air out through the nose, and absolutely no "n" at the end.
One syllable. Where "bon" sits in a phrase decides its weight — as an adjective before a noun it is usually light and leads into the noun's stressed syllable, as in bon COURAGE.
Listen: bon
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Ce gâteau est très bon.
This cake is very good.
Listen: Ce gâteau est très bon.
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"Ce gâteau est très bon" puts "bon" at the very end, which is where the phrase's pitch peak lands — so here the nasal vowel gets its full length and you can really hear it. Note that "très bon" makes no liaison, because "bon" starts with a consonant; the silent "s" of "très" stays silent. The circumflex in "gâteau" is historical and does not change the vowel for most speakers.
English speakers borrow the pronunciation from phrases already in English — "bon voyage", "bon appétit" — where we say a clear "bon" with a full "n". That final consonant does not exist in French. It also matters here because the feminine form "bonne" DOES have a real "n" and a non-nasal vowel: /bɔn/. Say "bon" with an "n" and you have effectively said the feminine form, which is a grammar error as much as a pronunciation one.