Blend all ingredients, except cheese and garnish, in a food processor. Cut the Brie in half horizontally. Place the bottom half, cut side up, on a plate. Spread with olive mixture (tapenade), saving a spoonful to garnish the top. Set on top half of cheese.
Refrigerate until ready to serve. When ready to serve, warm at room temperature 30 minutes. Garnish top with the spoonful of tapenade and basil or oregano sprig. Serve with sliced baguette or crackers.