Prepare:

1. Line Baking Sheet: Line a large baking sheet with parchment paper or a silicone baking mat. Set aside near your stove—you’ll need it ready when the walnuts are done. Do NOT skip this step or use an unlined pan—the hot, sugary nuts will stick permanently!
2. Prep Walnuts: If using walnut pieces with small crumbles, sift out the smallest bits (they’ll burn). Have walnuts measured and ready near the stove.

Cook the Glaze:

3. Combine Wet Ingredients: In a large skillet over medium heat, combine sugar, butter, and water. Stir gently to help everything melt together. The water helps the sugar dissolve evenly and prevents burning.
4. Dissolve Sugar: Cook, stirring frequently, until the butter melts and the sugar completely dissolves, about 2-3 minutes. The mixture should be smooth with no sugar granules visible.
5. Bring to Simmer: Increase heat slightly to medium-high and bring the mixture to a gentle simmer. Let it bubble for 2-3 minutes, stirring occasionally. The mixture will become slightly thicker and more syrupy. Watch carefully—don’t let it darken too much or it will taste burnt.

Add Walnuts:

6. Add Walnuts to Glaze: Add the walnuts to the simmering sugar mixture. Stir immediately to coat all nuts evenly with the glaze.
7. Toast and Coat: Cook, stirring constantly, for about 5-7 minutes. The walnuts will toast, the glaze will thicken and coat the nuts, and the mixture will become more caramelized. You’ll notice the glaze going from liquid to thicker and eventually crystallizing slightly on the nuts—this is perfect! Keep stirring to prevent burning.
8. Add Flavorings: When the glaze has thickened significantly and coats the nuts (they’ll look matte and sugary rather than wet and shiny), remove from heat. Immediately add cinnamon, vanilla extract, and salt. Stir vigorously to coat all nuts with the spices. The heat will release the cinnamon’s aroma beautifully.

Cool and Separate:

9. Transfer to Baking Sheet: Working quickly (the mixture hardens fast!), pour the glazed walnuts onto your prepared parchment-lined baking sheet. Use your wooden spoon or spatula to spread them into a single layer as much as possible.
10. Separate Nuts: Working quickly while the nuts are still warm (but not too hot to touch), use a fork or your fingers to separate the walnuts from each other. This is important! If you let them cool completely in a clump, they’ll harden into one big cluster. You want individual nuts. Work quickly but carefully—they’re hot!
11. Cool Completely: Let the walnuts cool completely on the baking sheet, about 15-20 minutes. As they cool, they’ll become crispy and crunchy. If some stick together despite your efforts, break them apart once completely cool.
12. Sprinkle with Salt (Optional): For extra flavor dimension, sprinkle the cooled nuts with a tiny pinch of flaky sea salt. The sweet-salty combination is addictive!