Both requests were already done.
Carrigon has a mod to allow children to prepare any meal using the toy oven. Read the instructions how to install and use the mod first. This
toy oven is what I use. Didn't need to start a home business in order for my children to make themselves something to eat. Mileage may vary on this one. There's two other versions of this to check out too. One version doesn't have Seasons. The other version lets kids prepare pizza and heat them up in the toy oven. Just click on Carrigon's Foods and Drinks above the thread to look at the other two versions.
The second request requires a patch to prevent Social Workers from coming to take the child away if he/she was left alone at home. The patch is called
No Social Worker Patch. Scroll down until you see this one at
Simlogical - Childcare.
Let us know if these are what you're looking for.