Can I buy food after shabbat from a non jew who made it on Shabbas
There are two issues here. The first one would be if the non-Jew cooked the food, it might make the food bishul akum, depending on what was cooked. Regarding Shabbas, it depends if the Non-Jew prepared it for the Jewish customers or not. Please let me know more of the specifics of the situation so I can answer you better.