Preheat your oven to 350 degrees Fahrenheit.
In a medium bowl, combine sour cream, garlic powder, and softened butter along with a large pinch of kosher salt and fresh cracked pepper. Stir until mostly smooth.
Incorporate shredded Monterey Jack cheese and thinly sliced green onions into the sour cream mixture, stirring well until everything is evenly combined.
Gently fold in both green and black olives into the cheese mixture.
Slice your French bread loaf in half widthwise and then cut each half lengthwise.
Divide the olive mixture evenly between all four pieces of bread, spreading it generously on the cut side. Bake for about 20-25 minutes until the cheese is melted and golden brown.