Freshly grate the cheese for best results! It will melt a lot better. You can also use pre-packaged cheese slices. Pick ones that melt well, such as American or Colby Jack cheese. Cook over medium low heat, otherwise the exterior will burn before the cheese has a chance to fully melt. Flip a few times for even heat distribution, and press down the grilled cheese slightly as it cooks. Use a non-stick skillet or griddle to prevent sticking. Substitutions and variations: Cheese: Swiss, Monterey Jack, Havarti, Gouda, or Muenster. Bread choice: Sandwich bread, sliced brioche, sourdough. Add-ins: roasted garlic cloves (instead of minced garlic), deli meat, caramelized onions, sliced apples.