Preheat your oven to 500°F (260°C).

Line a baking sheet with foil or a silicone mat for easier cleanup.

In a medium bowl, thoroughly combine the softened butter, mayo, green chiles (with their juices), and shredded cheddar cheese until well blended.

Slice the French bread loaf in half lengthwise.

Spread the chile-cheese mixture evenly across both cut sides of the bread.

Arrange the halves, cut-side up, on the prepared baking sheet.

Bake at 500°F for 5 minutes to melt the cheese.

Then switch to broil and cook until the topping is bubbly and lightly browned—watch closely (about 1–2 minutes).

Remove the bread, let cool just a bit, then slice into portions.

Serve warm and watch it disappear fast!