Preheat the oven to 350°F (175°C). In a mixing bowl, combine sliced peaches, sugar, and lemon juice. Toss to coat the peaches evenly.

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 pecans on top.

Bake in the preheated oven for 45 minutes or until the top is golden brown and the peaches are bubbly.

Let cool for a few minutes before serving.