Combine the pistachios and almonds in a food processor and pulse until chopped. Add the cholate, cinnamon and salt. Pulse until well mixed.
Add the butter to a small pot set over medium heat. Allow the butter to brown lightly until it smells toasted, about 2-3 minutes. Remove from the heat.
Divide the filo sheets into 3 stacks (12 sheets per stack, but do not stress on it). Lay 1 stack flat in the bottom of a 9x13 inch baking dish. Evenly pour over 1/3 of the butter. Sprinkle over 1/3 of the nut mix, then layer with a second stack of filo. Our over another 1/3 of the butter. Sprinkle over the remaining nuts, then add the final stack. Our over the remaining butter.
Cut into the baklava lengthwise into 1 1/2 inch strips. Then make diagonal slices, 1 1/2 inches apart, to create a diamond pattern (see photo). Bake 40-45 minutes until golden.
Meanwhile, combine the honey, vanilla and 1/3 cup water in a medium pan. Bring to a boil, reduce the heat and simmer 5 minutes until thickened slightly. Pour the syrup over the warm baklava. Let soak for 2 hours or overnight. Enjoy!