grinding oatmeal and potty training

Does anyone know a way to grind up Oatmeal so that it is like powder? kinda like baby ceral? I refuse to buy baby oatmeal becasue morgan doesn't eat enought of it but lately i thought that if i grind up normal oatmeal and put in in what ever shes eating for dinner she just night sleep longer at night and the night i tried it she slept all night so i think i am going to continue to do that but does anyone know how i can get it more like a powder then like sand? Also how do i get it some what softer so that she is not having to gum everything. i put it in the microwave last night which seemed to help somewhat  but i dont want to have to do that every night.

Brekke is virtually potty trained but really wears a diaper for naps and bed time, I have been scared to take the plung and just go out with no diaper just panties but i wanted to know how other have done it that have potty trained