Preheat the oven to 200 ° C top / bottom heat. Place the tortilla on a baking sheet.
Mix the tomato puree, tomato paste and spices well. Cut the mushrooms into thin slices. Spread the tomato sauce on the tortilla, spread the mushrooms on top. Take the capers out of the brine and spread on top. Crumble the feta cheese evenly over it.
Place in the oven and bake for 8-10 minutes. Observe carefully so that the edges do not burn (this can easily happen depending on the oven).
The topping can be changed as desired with vegetables.