Take a brush and brush the bottom and the sides of the baking sheet. Place one sheet of phyllo at the bottom of the dish, then butter the top of the sheet. Place another sheet on top of it and brush the top again with butter. Repeat this until you have 6 layers of phyllo.
Layer generously with chopped pecans or walnuts, about 1¼ cups.
Layer with another phyllo sheet and butter it well. This sheet will be a bit more difficult to brush. Another option is to brush the phyllo sheet with butter and lay it with the buttered side down over the pecans.
Lay another sheet over it and brush with butter. Repeat until you have another 5 phyllo sheets. Layer with another 1/3 of the pecan mixture then repeat with 5 more of the phyllo sheets. Repeat this until you have 3 layers of pecans. 6 Phyllo pastry sheets1 Layer of chopped pecans5 Phyllo pastry sheets1 Layer of chopped pecans5 Phyllo pastry sheets1 Layer of chopped pecans5 Phyllo pastry sheets (or remaining sheets) Butter the top phyllo sheet with butter as well. Using a sharp knife cut the baklava diagonally, or into squares, which ever way you prefer.
Transfer to the preheated oven and bake for 35 to 40 minutes or until golden brown.
Remove the baklava from the oven, pour the syrup immediately over the baklava, making sure you pour all over. Finally, top each piece of baklava with remaining chopped nuts.
Take a sharp knife and run it through the cut baklava again, just to make sure we can easily take out each piece.
Let the baklava sit for a few hours, preferably overnight, so that the syrup sets in and it gets all nice and sticky. Serve and enjoy!