HEAT oven to 400°F.
CHOP half the apple finely; place in small bowl. Add nuts and syrup; mix well. Stack phyllo sheets, brushing butter between each layer. Reserve remaining apple and butter for later use. Cut phyllo into 10-inch circle; discard trimmings. (Or see Tip for how to use to make garnish.) Place bottom half of brie in centre of phyllo circle; top with half of apple mixture. Cover with top of brie and remaining apple mixture.
WRAP phyllo around cheese, folding phyllo as needed to completely enclose cheese. Brush with remaining butter. Place on baking sheet or in pie plate.
BAKE 15 min. or until golden brown. Place on platter. Cut remaining apple into thin slices. Add to platter with remaining ingredients to serve with the brie.