Instructions:

Slather two slices of sourdough with room-temperature butter. Place butter-side-down in a cast iron skillet and cover with slices of smoked gouda cheese. Cook covered on low heat until the cheese melts. Remove the cover and increase heat to medium-low or medium until the bottom turns golden brown and delicious (GBD). Place one on top of the other (cheese on cheese), cut in half, and serve.