Preheat oven to 350 degrees F.
Slice the loaf of bread in half, lengthwise. Scoop out some of the surface, making a shallow well. Place on a baking sheet.
In a large bowl, mix together the mayonnaise, butter, and Sriracha until combined and smooth. Add in both olives, cheese, and scallions; mix to combine.
Divide and spread the filling evenly between the two bread halves.
Bake for 25-30 minutes or until cheese is melted and browning.
Cut into 2-inch portions across and serve as an appetizer.
