Thaw phyllo in the fridge overnight, then leave it at room temperature for about an hour, unopened, within its package.
Preheat the oven to 150°C / 300°F.
Finely chop the nuts. Use a food processor and pulse the almonds and walnuts until finely chopped.
Make the filling. Mix the chopped nuts with the breadcrumbs, 2 tablespoons of sugar, ground cinnamon, and ground cloves.
Cut the phyllo in half so the sheets fit inside a 9 x 13-inch (23 x 33 cm) pan. Cover with a tea towel so it won't air-dry.-See Notes Below. Combine melted butter with olive oil.
Brush the bottom of the pan generously with the butter-oil mixture.
Add 6 phyllo sheets at the bottom. Begin with 2 phyllos, brush with butter, add 2 more, and repeat.
Sprinkle 3-4 tablespoons of the filling.
Add 2 more phyllo sheets and brush with butter. Repeat making layers until you use up all the filling.
Top with 8-10 phyllo sheets, brushing them with butter in between.
Cut the Baklava into pieces. Cut into 3 long strips (lengthwise) first, then cut diagonally to form diamond shapes. Cut all the way through to the bottom of the pan.
Pour the remaining melted butter on top.
Decorate with cloves (optional). Press a whole clove to the center of each piece.
Bake for about 1 hour and 30 minutes in the lower rack of the oven. Until the pastry turns honey-golden in color and becomes very crispy.