In small bowl, add brown sugar, flour, salt, cinnamon. Mix well. Then add in cold butter slices and using a pastry cutter or fork, press butter until its in small pieces and incorporated in the flour/brown sugar mix. Add in chopped or halved pecans and maple syrup (optional) and mix until combined.
1 cup halved or chopped pecans, ½ cup packed brown sugar, ⅓ cup all-purpose flour, 3 tablespoon vegan butter, pinch salt, pinch pumpkin pie spice, 1 tablespoon maple syrup