Begin by crumbling the feta cheese into small pieces and slicing the sourdough bread into ¾ inch thick slices.

In a mixing bowl, combine the crumbled feta, chopped sun-dried tomatoes, finely chopped olives, and vibrant fresh spinach. Season with garlic powder and black pepper.

Spread the filling evenly between two slices of the prepared sourdough bread and press slices together gently.

Place a skillet over medium heat with olive oil, allowing it to heat for 1-2 minutes.

Carefully place the sandwich in the skillet and cook for around 3-4 minutes until golden brown, then flip and cook the other side.

Remove the sandwich from the skillet, allow it to rest for about 1 minute, slice it in half, and serve warm.