Final Answer:
The special ingredient that Sue adds when baking cookies for Coach Beiste is salt.
Step-by-step explanation:
In the context of the question, the mention of Sue baking cookies for Coach Beiste with a special ingredient points to a specific episode or scene from a show or series. In this case, the special ingredient is salt, which can add a unique and unexpected twist to the cookies. Salt is commonly used in baking to enhance flavors and balance sweetness, but Sue's choice of adding it as a "special" ingredient adds humor or a distinctive touch to the narrative, reflecting the creative and sometimes unconventional nature of fictional storytelling.
The inclusion of specific ingredients in scenes like these often serves both narrative and comedic purposes, providing memorable moments in the storyline. It's a device used to engage the audience and add depth to the characters' personalities through their actions and choices, even in seemingly mundane activities like baking.