Combine blue cheese and walnuts. Spread 4 1/2 tsp. apricot preserves on cut side of one half of Brie cheese; sprinkle with half of blue cheese-walnut mixture. Place remaining half of Brie cheese on top; spread with remaining 4 1/2 tsp. apricot preserves.
Wrap 3 in. high strip of foil tightly around Brie; secure with piece of tape. Sprinkle remaining blue-cheese-walnut mixture over half of apricot preserves to form crescent moon shape.
Bake cheese in 8x8 in. baking pan 7 - 9 min. or until soft and beginning to melt. Serve immediately with crackers.