We made Peach Butter last weekend. We used Crest Haven peaches, since they are cooked, I'm not sure it would matter the type.
9 lbs of peaches, peeled and sliced
2 lbs of sugar
4 tsp of cinnamon
1 Gal of apple cider*
We used a Ninja cooking system, so we could go from boiling to putting it on slow cook for several hours, otherwise if you use a pot on the stove you'd need to stir constantly. A regular crock pot (on High) could be used, but would take a bit longer.
Boil the cider down until you have 50% left
* an alternative is to use apple juice concentrate, just don't add as much water
Add peaches and boil until soft (~15 to 20 mins, but may be longer for harder peaches)
Turn down to a simmer (or use slow cook settings on crock pot)
After a few hours you'll want to use a hand blender to smooth out the butter. Unlike apples that completely break down, peaches will need to be blended.
Once it is smooth, check the consistency to determine if it needs more cook time to reduce the water content. Remember it will thicken a bit when it cools, just like oil. (I knew I could get an oil reference in here)
Take it off the heat or turn off the crock pot and stir in the sugar and cinnamon. We learned last year not to put the sugar in earlier in the process as the butter got gummy since the sugar was cooked for a long time.
We let it cool for a few hours and then put it in bags and use a vacuum sealer, then throw the bags in the freezer.
It should make about three quarts or so (we never really measured it out to be sure).