Preheat oven to 300°F.

Line a rimmed baking sheet with aluminum foil. Brush foil with the melted butter; set pan aside.

In a large bowl, whisk together the egg white and water. Add pecan halves and toss until well coated.

In a separate bowl, stir together the sugars, salt, and cinnamon. Add this mixture to the bowl with pecans and toss until well coated.

Spread pecans across buttered baking pan. Bake at 300°F for 45 minutes, stirring every 15 minutes.

Let cool before serving.

{Optional} Toss pecans in an additional 2-3 Tbsp of sugar after they've cooled.