10 Minutes Prep Time
Mix the butter and garlic together until smooth.
In a separate bowl, mix together the cheeses and the onion, then stir in the mayonnaise.
Add the butter mixture to the cheese mixture and combine
Slice loaf of bread, lay crust side down on a foil-lined baking sheet and then spread cheese mixture over the bread
Place under a preheated grill until nicely browned, about 3 to 5 minutes.
Leave to sit for 5 minutes until cool enough to handle, then slice the bread into fingers with a bread knife. Delicious!