Loaf of baguette bread (sliced to 1/2 slices)
1 C mayo
1/2 C chopped green onions
1 C parmesan/romano cheese (the grated kinds, like Kraft)
Mix onions, mayo, and cheese
Now, you can juggle the amounts a little to fit your tastes, but you want it to end up as a thick paste.
Heat your broiler.
Top each slice with a thick layer of the mixture and place under broiler till golden brown.
These are wonderful when warm, but even at room temp they are still pretty amazing.