Without cutting all the way through, cut twelve 1-in. (2.5-cm) thick slices into loaf. In small bowl, stir together oil, garlic, salt and pepper. Brush mixture between and onto the bread slices, including top of loaf. Stuff cheese between slices. Wrap loaf loosely in foil. Place on grill preheated to medium-high.
Close lid and cook 6 to 7 min. until cheese starts to melt. Open foil to reveal top of loaf and move to indirect heat and cook 5 to 7 min. longer, until bread is lightly toasted and cheese is golden. Cool slightly; pull slices apart to serve.
Add 1 tbsp (15 mL) finely chopped parsley, chives or basil to garlic oil.
Stuff with chopped sundried tomatoes and cooked bacon to make a heartier appetizer.