Preheat your grill to a medium-high heat, aiming for a temperature of around 400°F (204°C).
While the grill is heating, prepare the bell peppers by slicing them into quarters, removing the stems, seeds, and membranes.
In a small bowl, combine the olive oil, sliced garlic, salt, and black pepper.
Brush each piece of bell pepper with the olive oil mixture, ensuring both sides are well coated.
Place the peppers skin-side down on the grill. Grill for about 6-8 minutes, or until the skins are charred and blistered.
Flip the peppers and grill for another 4-7 minutes, until the flesh is tender and has nice grill marks.
Once grilled to perfection, transfer the peppers to a serving platter.
Sprinkle the chopped basil over the warm peppers, allowing the heat to release the basil's aroma.
If desired, finish with a drizzle of balsamic vinegar for an added depth of flavor.
Serve warm or at room temperature, as a delightful accompaniment to any Mediterranean feast.