Preheat grill to low-medium heat.
In a small bowl, combine olive oil, garlic, red pepper flakes, basil and salt. Brush both sides of the bread with the olive oil and garlic mixture.
Place the bread on the grill and grill both sides, until golden and crisp; about 5 minutes. Sprinkle the top with cheese and place in the broiler until bubbly and golden, if inside. If outside, cover the grill and cook until the cheese is melted and bubbly. Serve immediately.