This grilled cheese sandwich is rich and gooey, with four types of melty cheese. It can easily be made vegan and gluten-free, and only takes 20 minutes to make.
In a small bowl, use a fork to mix together the butter, parsley, garlic, salt, and black pepper until well combined.
Spread about 1 tablespoon of the butter on one side of both slices of the bread. Place the bread, butter side down, on a large nonstick skillet over medium heat. Divide the cheese between the bread, tearing the cheese to fit, as needed. Add optional arugula and apple slices, if using.
Close the sandwich with the top bread slice, butter side up, pressing down gently. Cook, until the bread is golden brown and toasted underneath, about 2-4 minutes. Carefully turn the sandwich over and cook until the second side is golden brown and the cheese is melted, about 3-4 minutes. Transfer to a cutting board and slice in half.
Nutrition info is based on using regular butter and cheese, not vegan options.