Preheat panini press to high heat or a large skillet or griddle over medium-high heat.
Mash roasted garlic cloves with the back of a fork. Season with salt and a liberal amount of black pepper, to taste.
Butter one side of two slices bread. Place on panini press or griddle. Top each with ¼ cup of cheese. Spread bottom of remaining bread slices with roasted garlic; press onto cheese. Butter the top of each sandwich. Heat about 5 minutes on panini press, until browned. If using a skillet or griddle, heat about 3-4 minutes on each side.