Overnight Hot Dog Sandwiches - Mid-Century Menu

Ingredients

• 2 cups grated mild American cheese
• 8 hot dogs, finely chopped
• 3 oz cream cheese, room temperature
• 18 slices white-bread, crusts removed
• 4 eggs, beaten until lemon yellow
• 2 ½ cups milk
• ⅛ tsp salt
• ⅛ tsp pepper
• 1 tbsp butter
• ½ cup chopped onion
• 1 10 oz can cream of mushroom soup
• 1 cup half-and-half cream
• 3 hard-boiled eggs, peeled and coarsely chopped
• 1 tbsp parsley, finely chopped