Preheat the oven to 350ºF.

In a bowl, combine the softened butter, cheese, , mayonnaise, white parts of the chopped scallions and minced garlic. Stir until thoroughly combined.Split the loaf of bread in half lengthwise and spread both sides with the cheese mixture.Bake the bread for 7 minutes then place it under the broiler just until golden brown, about 3 minutes.Top the bread with the green parts of the chopped scallions, cut it into slices and serve.