Ham and Swiss Puffs

Recipe from a very old Family Circle cookbook.  Great make ahead recipe for brunch.

2 cups ground cooked ham (about 1 pound)
2 cups grate Swiss cheese (about 1/2 pound)
1/2  cup mayonnaise or salad dressing
1 teaspoon prepared mustard
12 slices sandwich bread, toasted
6 eggs
2-1/4 cups milk

Combine ground ham, grated cheese, mayonnaise or salad dressing and mustard.
Spread mixture on 6 slices of toast.  Cover with remaining slices of toast.
Cut each sandwich diagonally into four triangles.
Stand, crust edge down, into a buttered 9" x 13" pan.
Beat eggs with milk.
Pour over sandwich triangles, cover and chill at least 4 hours or overnight.
Bake at 325F for about 35 minutes or until custard sets.
Let cool slightly so it is easier to cut.