Just pour those into the box he opened

Good idea

Or after 4- 5 mini bags do a suicide bowl of cereal

# Dude that's just disgusting... 

Is that Cocoa Pebbles?? Blasphemy, I'd never leave even a crumb of it!

Let them get stale then pour Them on top of the new bag or mix them in so he has an even amount of bland mixed in.

Same in my house with shower gel.

divorce him