Place the sliced peaches in a bowl. Toss gently with cinnamon.
In a medium to large bowl, lightly beat egg yolks. Add in the sugar, sour cream, flour and salt. Whisk until well combined. Pour egg mixture over peaches.
Bake the pie on a baking sheet on the centre rack for 50-60 minutes until the filling is set. Use a pie guard or foil if the edges are browning before the pie is set. The edges will be set but the centre will be just ever so slightly jiggly. Transfer the pie to cool on a wire rack. Chill in the fridge to ensure that the filling is set before slicing.
To prepare peaches for the pie: Boil water in a large pot. Cut small crosses at the bottom of the peaches. Place all the peaches into the pot. After 30 seconds or so in the boiling water remove the peaches with a slotted spoon and transfer immediately to a ice water bath. Gently pry the skin starting at the sliced skin with a sharp knife. The skin will pull away easily. Slice into 5 or so slices and place in a bowl.
You may need 5 peaches if they are on the small side.