Preheat the oven to 350°F
Line a baking sheet with parchment paper
In a bowl, whisk 1 egg white until foamy
Add 1 tablespoon water and whisk again
Add 1 cup walnut halves and toss to coat
Add 1/2 cup granulated sugar
Add 1/2 teaspoon cinnamon
Add 1/4 teaspoon salt
Toss until the walnuts are evenly coated
Spread the walnuts in a single layer on the baking sheet
Bake for 10 to 15 minutes, stirring once halfway through
Remove from the oven when golden and fragrant
Cool completely on the baking sheet
Break apart any clusters before serving or storing