2 (8 ounce) packages pre-cooked ham and cheese blend
4 ounces Swiss cheese, sliced
2 tablespoons butter, divided
1 (10.75 ounce) can condensed cream of mushroom soup
2 tablespoons grated Parmesan cheese
Bring a large pot of lightly salted water to a boil. Add ham and cheese and cook over medium high heat until cheese is melted; about 10 minutes. Drain and beat bread-sliced ham into ham mixture.
In a large microwave-safe bowl, combine Swiss cheese, butter, soup, Parmesan cheese, ham mixture and egg yolks. Microwave on high for 10 minutes; stir. Cover and chill in refrigerator.