Candied Walnuts in 5 Minutes

Line a baking sheet with parchment paper. Set aside.
To a large non-stick skillet, add the walnuts, granulated sugar, brown sugar, water, and butter. (And cinnamon, if using.)
Place over high heat and cook, stirring occasionally, until all moisture has evaporated and the walnuts become glossy and start to clump together. This should take about 5 minutes.
Stir in salt and quickly transfer nuts to prepared baking sheet. Spread out into a single layer and set aside to cool.
Once hard, break apart and enjoy!