Cut French bread loaf in half horizontally.
Combine butter, mayo, garlic, seasoning, cheeses, and olives.
Evenly coat the cut side of the bread with the olive mixture.
Sprinkle sliced green onions over the top.
Bake at 400°F for 20–25 minutes until bubbly and golden.
Broil for 1–2 minutes to crisp the top.
Let cool slightly, slice thick, and enjoy warm.
