Wash the spinach thoroughly and remove excess water.
Prepare a slice of bread.
Heat a pan and add olive oil.
Add the spinach to the pan and lightly sauté with a pinch of salt.
Spread the sautéed spinach evenly over the bread.
Add cheese on top if desired.
Toast the bread in a pan or toaster until golden brown.
Cut into bite-sized pieces and serve on a plate.