Preheat the broiler and set the oven rack in the top position. Place the feta in a small (1-quart) baking dish and set aside.
Heat the oil in medium saucepan over medium heat. Add the garlic and cook, stirring constantly, until lightly golden, 1 to 2 minutes. Add the tomatoes, salt, pepper and sugar; cook, stirring frequently, until the tomatoes are softened and starting to burst, 2 to 3 minutes. Remove from the heat and stir in the capers.
Scatter the tomatoes around the feta and broil until the feta is softened and browned on top, 3 to 4 minutes (but keep an eye on it as broilers vary greatly.) Serve warm with bread.
