Creating the Feta Grilled Cheese Sandwich with Spinach is simple with these easy steps:

1. Prepare the Ingredients: Gather all your ingredients. Rinse the spinach leaves and pat them dry.
2. Mix the Filling: In a bowl, combine the crumbled feta cheese and spinach. Season with salt and pepper according to your taste.
3. Butter the Bread: Spread butter on one side of each slice of bread. This will help create a crispy, golden crust when grilled.
4. Assemble the Sandwich: Place one slice of bread on a clean surface, buttered side down. Spoon the spinach and feta mixture on top, spreading it evenly. If using, add sliced tomatoes or any other desired toppings. Top with another slice of bread, buttered side up.
5. Heat the Pan: In a skillet, heat the olive oil over medium heat. Once hot, carefully place the sandwich in the pan.
6. Grill the Sandwich: Cook for about 3-4 minutes or until the bottom slice is golden brown. Flip the sandwich carefully and cook the other side for another 3-4 minutes, pressing down gently with a spatula.
7. Check for Doneness: Ensure both sides are crispy and the cheese is melted. If needed, lower the heat and cover the pan for a minute to help the cheese melt thoroughly.
8. Remove and Slice: Once done, remove the sandwich from the skillet and let it cool for a minute. Slice it in half for easier handling.
9. Repeat: If making multiple sandwiches, repeat the process with the remaining ingredients.
10. Serve Warm: Enjoy your delicious Feta Grilled Cheese Sandwich with Spinach while it’s warm and gooey.