Place a slice of cheddar cheese on each piece of sourdough bread, close and generously butter the outside of the sandwich.

Heat a skillet over medium-low heat. Grill the sandwich slowly until the bread is golden brown, flip and continue grilling until the cheese is melty. Remove from heat and let it cool.

Slice the cooled sandwich in half and pack it in a lunch container. Pack any sides like fruit or veggies in separate compartments to keep them fresh. Use an ice pack if needed.