Are yeast spores in expired cake or pancake mix harmful?

It's unlikely that yeast spores in expired cake or pancake mix would be harmful. Here's why:

* Yeast is a fungus: While some fungi can be harmful, yeast is generally considered safe for human consumption. In fact, it's used in many foods and drinks.

* Spores are dormant: Yeast spores are dormant and don't actively grow until they encounter favorable conditions, like moisture and warmth.

* Expired mixes don't have ideal conditions: Expired cake or pancake mixes typically lack the moisture and warmth necessary for yeast spores to germinate and grow.

However, here's what you should consider:

* Mold growth: While yeast spores are unlikely to be a problem, expired mixes are more susceptible to mold growth. Mold can be harmful, so it's important to check for any visible signs of mold before using the mix.

* Taste and texture: Even if the mix is free of mold, the taste and texture might be compromised due to the breakdown of ingredients over time.

To be safe, it's always best to use cake and pancake mix within its expiration date. If you're unsure, it's better to err on the side of caution and discard it.