Preheat the oven to 350ºF.
In a bowl, combine the softened butter, Asiago cheese, Monterey Jack cheese, mayonnaise, sliced scallions and minced garlic. Stir until combined.
Slice the loaf of bread in half lengthwise then 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.
Cut it into slices and serve.
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