Preheat the oven to 350°F (175°C).

In a mixing bowl, combine sliced peaches, sugar, and cinnamon.

Unroll the crescent roll dough and place a spoonful of the peach mixture on each triangle.

Roll the dough around the peach filling, starting from the wide end.

Place the dumplings in a baking dish and drizzle with melted butter.

Bake for 30 minutes or until golden brown.