Step 1

Line a baking sheet with parchment paper. Set aside.

Step 2

To a large non-stick skillet, add the walnuts, granulated sugar, brown sugar, water, and butter. (And cinnamon, if using.)

Step 3

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.

Step 4

Stir in salt and quickly transfer nuts to prepared baking sheet. Spread out into a single layer and set aside to cool.

Step 5

Once hard, break apart and enjoy!