For those of you reading this topic, please do remember there's many a great simple recipe where one can make use of unused breakfast cereals rather than throwing them out.
Some of those recipes are non bake, and don't need the oven to cook them.
We all to often make the excuse, "I don't have time" alas we all have time to go to the supermarket and do whatever else in one's day.
Make time, chill out and enjoy, you may even find and establish a new talent!!
It's easy enough to put the finished product in the freezer and store them that way for future use including your own personal use or that of guests who you know will appreciate some home made baking.
Milk can be used to make things like custard or milkshakes , smoothies etc
Alternatively, take the unused portion, or finished baking into work or pop next door to a neighbour who may not be so fortunate, or lives on their own who may appreciate a friendly thoughtful deed.
In today's day and age there's far to much unnecessary waste when there should be minimal waste.
All the best.