Preheat the oven to 350°F (175°C). In a mixing bowl, combine sliced peaches, sugar, and lemon juice. Stir until well mixed.

Spread the peach mixture evenly in the bottom of the baking dish.

Sprinkle the dry cake mix evenly over the peaches.

Drizzle the melted butter over the cake mix, ensuring even coverage.

If using, sprinkle chopped nuts on top.

Bake in the preheated oven for 35-40 minutes, or until the top is golden brown and the filling is bubbly.

Let cool for a few minutes before serving.