1 1/2 c. cheddar cheese, grated
1 c. Jack cheese, grated
1 c. Mozzarella cheese, grated
3 green onions, chopped
1/2 c. mayonnaise
Brown and serve type sourdough bread, sliced in half lengthwise

Combine cheeses, onion, and mayonnaise (use enough mayonnaise to just hold cheeses together). Firmly pack cheese mixture on sliced side of bread loaf. Bake "open face" on cookie sheet until cheese is bubbly, 350 degrees for 15-20 minutes. Cooking time will depend on thickness of cheese layer. Cut in 1 inch slices.

All amounts are approximate.