Preheat grill to high.

With a sharp knife, scrape rind off of top of brie to expose cheese. Set aside. 

Mash slow roasted garlic cloves with back of fork in a medium bowl. Add green onions, red pepper, thyme, balsamic vinegar, 2 tbsp of olive oil, black pepper and salt.

Spread mixture over brie.

Place soaked plank on grill, close lid and bake for 10 minutes until it begins to crackle and smoke. 

Being careful of smoke, open lid and place cheese on plank. 

Close lid and plank-bake for 10-12 minutes until cheese begins to melt and bubble.

Remove plank from grill. Serve with slices of crusty bread and small roasted baby potatoes.