Prep Ingredients: Gather your ingredients, slice the ciabatta roll in half, and slice the fresh spinach, tomato, and avocado into thin rounds.

Cook the Egg: Heat a skillet over medium heat, add olive oil, and cook the egg for 3 to 4 minutes until golden and sunny-side up or scrambled.

Toast the Roll: Optionally toast the ciabatta halves in the skillet, cut side down, for 2 to 3 minutes until golden brown.

Assemble Sandwich: Layer spinach, tomato slices, avocado, feta cheese, and the cooked egg on the toasted ciabatta.

Finish and Serve: Place the top half of the ciabatta roll over the layers, press gently, and cut the sandwich in half if desired.