Instructions

  1. Heat butter in a pan.
  2. Sautéed mushrooms with thyme until golden.
  3. Salt and pepper.
  4. Garnish 4 slices of bread with a slice of cheese, 1/4 of the mixture on each slice, and a little bit of mustard, if wanted.
  5. Cover with the remaining slices of bread.
  6. Heat a little bit of butter and oil in a pan.
  7. Grill sandwiches on each side until they are well golden and the cheese has melted.