Creating the Mediterranean Spinach Grilled Cheese is simple if you follow these steps:

1. Prep the Ingredients: Gather all your ingredients and chop the spinach and garlic.
2. Mix the Filling: In a bowl, combine the chopped spinach, feta cheese, mozzarella cheese, minced garlic, and season with salt, pepper, and red pepper flakes if using.
3. Butter the Bread: Spread the softened butter on one side of each slice of bread. This will create a beautiful golden crust.
4. Assemble the Sandwich: On the unbuttered side of two slices, place a generous amount of the cheese and spinach mixture. Top with the other two slices of bread, buttered side facing out.
5. Heat the Pan: Preheat a skillet over medium heat. Once hot, add the sandwiches.
6. Cook until Golden: Cook each side for about 3-4 minutes or until they turn golden brown and the cheese melts.
7. Check the Cheese: To ensure that the cheese is thoroughly melted, cover the pan with a lid for the final minute of cooking.
8. Slice and Serve: Remove the sandwiches from the skillet, slice in half, and serve warm.

Following these straightforward steps will guide you in creating this incredible variation of grilled cheese effortlessly.