I too make yogurt at times. Just fill a large bowl of warm water. Add starter ( usually a plain yogurt) to a gallon of milk, and put in water for a day in a warm place or change out the water. I have used the oven, but watch carefully, and turn off oven after it is warmed up.

My kids dont sweeten this homemade version as it is a bit sweeter than any commercial brand.

I bought a number of high protein items via bob's red mill for the kids to make a higher proteined breakfast " oatmeal". Hemp seeds, and such. Honey and maple syrup as sweetener.