Step 1: Sautee your mushrooms, season to taste and set aside.
Step 2: Heat 1 tablespoon butter in a cast-iron or non-stick skillet over medium-low heat.
Butter one slice of bread and place it butter side down onto the frying pan and then add 2 slices of Edam cheese. On top of that add the sautéed mushrooms, the olives and the rest of the shredded cheese.
Tip: When the butter is too hard to spread, I usually melt it in a pan and place my bread in there to absorb it.
Step 3: Take a second slice of bread, butter it on one side and place it butter side up on top of your sandwich. Cook for 3-4 minutes until golden brown and flip over. The secret here is to cook the sandwich over medium-low heat to make sure the cheese is thoroughly melted.