Preheat the oven to 400°F/205°C and line a baking sheet with parchment paper. Set aside.
In a medium bowl, combine peaches, sugar, cinnamon and lemon juice. Toss the peaches to coat them evenly (make sure they are coated on both sides). You can let it rest for 10-15 minutes if you want, so the juice can release from the fruit and leave a delicious peach sweetened syrup, or you can bake immediately.
Transfer the peaches on a baking sheet lined with parchment paper, spread them in a single layer. Roasted for 15-25 minutes depending on the desired texture you want.
Remove the peaches from the oven and let them cool to room temperature. Store them in an airtight container in the refrigerator for up to 2 weeks. The peaches can be frozen for up to 6 months.
To reheat: bake in the oven at 350°F/175°C for 10 minutes, until warmed through.