Place 4 loosely-packed cups of sliced peaches (these were frozen, but could as easily be fresh) in a blender.
Use the blender to finely chop the peaches.
And add 1-2 cups of yogurt and 1-2 teaspoons cinnamon (notice the hedge with measurements here—all I remember is that I deliberately made it a round number so it would be easy, but really, quantities can be flexible and to your taste). Blend once more.
Finely chop another peach (this one was fresh) for texture.
And stir into the mixture.
Pour into molds.