Evenly distribute 1st portion of cheddar across the bottom slice of bread, leaving 1/2" border, as shown in the photo.
Evenly distribute pizza cheese over the cheddar, also leaving 1/2" border.
Evenly distribute 2nd portion of cheddar over the pizza cheese, still leaving the 1/2" border.
Gently press the cheese to keep it contained inside the sandwich. Close the sandwich.
Spread .5 tbsp Crostini Butter evenly on both sides of the sandwich.
Wrap in appropriate day bag. -OR- Wrap in plastic wrap with a label on each sandwich.
Transfer sandwiches to clean food storage containers. Store refrigerated.
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