Preheat oven to 325°F
Mix oats, nuts, salt, and cinnamon in a big bowl
In a small saucepan: Warm honey + brown sugar + butter together. Stir until smooth and slightly bubbly. Remove from heat, add vanilla
Pour over oats and mix REALLY well. Everything should look glossy and slightly sticky
Dump onto a parchment-lined baking sheet. Press it down firmly into one big slab
Bake for 20–25 minutes. DO NOT stir halfway if you want clusters. You want it golden, not dark brown
Let it cool completely untouched
Break it up into chunks