In a bowl, combine the chopped nuts (walnuts or pistachios), sugar, and cinnamon. Mix well and set aside.

Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish with a bit of melted butter. Layer 10 sheets of phyllo dough in the dish, brushing each sheet with melted butter.

Sprinkle a thin layer of the nut mixture over the phyllo. Continue layering four sheets of phyllo followed by more nut mixture. Repeat this process until all nuts are used while finishing with 10 layers of phyllo on top, again brushing each layer with butter.

Before you bake, use a sharp knife to cut diamond shapes into the top layers of the phyllo, making sure to cut all the way through.

Bake in the preheated oven for 40-50 minutes, or until the Baklava is golden brown.

While Baklava is baking, combine honey, water, and vanilla in a saucepan. Bring to a boil, reduce the heat, and let simmer for 10 minutes.

Once the Baklava is out of the oven, immediately pour the hot honey syrup over it, making sure it seeps into the cuts.

Allow it to cool for at least a few hours before serving so it can absorb all that syrup goodness.