Toasted Walnuts in Spiced Syrup

Preheat oven to 375°F. Toast walnuts on a rimmed baking sheet until fragrant, about 10 minutes. Let cool slightly; coarsely chop. Combine maple syrup and cinnamon stick in a saucepan; simmer until reduced by half, about 10 minutes.

Remove from heat; discard cinnamon. Stir in walnuts and vanilla. Nuts can be stored in an airtight container at room temperature up to 3 days.