Pre-heat the oven to 350 degrees. In a small bowl beat butter and mayonnaise until smooth. Beat in parmesan cheese, garlic, oregano, basil and seasoning salt. Stir in Monterey Jack cheese.
Spread the mixture over the cut slices of bread. Place on a baking sheet.
Bake in the oven at 350 degrees for 10-15 minutes or until the cheese has melted.