Aunt Louise'S Cheese Squares - cooking recipe

Ingredients

13 ounces cream cheese, softened
1/4 pound sharp Cheddar cheese, grated
2 tablespoons butter
1 teaspoon Worcestershire sauce
2 egg whites
1 loaf white bread, crusts removed and cut into 1-inch cubes

Preparation

Melt cream cheese, Cheddar cheese, butter, and Worcestershire sauce together in top of a double boiler over simmering water, stirring frequently and scraping down the sides with a rubber spatula. Set aside to cool, about 10 minutes.
Beat egg whites in a glass, metal, or ceramic bowl until stiff peaks form; fold into cooled cheese mixture using a rubber spatula. Gently run spatula around the edges of the bowl, lifting the bottom up and over the center until blended.
Line a baking sheet with parchment paper.
Dip bread cubes into cheese and egg white mixture, coating thoroughly. Place on lined baking sheet and refrigerate, 8 hours to overnight.
Preheat oven to 400 degrees F (200 degrees C).
Bake in the preheated oven until golden, 10 to 12 minutes.