Clean and cut mushrooms into thin slices. Heat up 1 tbsp of oil in a non-stick frying pan and add mushrooms. Season with a pinch of salt and pepper. Cook on medium heat until nice and brown (up to 6 min). Transfer into a bowl and set aside.
Cook the washed and drained spinach in the same frying pan on medium heat for about 8 to 10 min. season with salt and pepper. Set aside.
Drain and cut your olives in half. Prepare feta and shredded cheese.
Preheat the oven to 190 degrease. Line baking tray with non-stick baking paper.
Cut the baguette in half, lengthwise. Spread tomato sauce on top. Add mushrooms then shredded cheese. Top up with spinach, feta, and olives. Sprinkle some dried oregano on top and bake for 7-10 min.
Meanwhile, prepare garlic sauce. Simply mix all the ingredients together in a serving bowl and season to taste with salt and pepper.
When your zapiekanka is nice and crispy take it out of the oven. Drizzle some garlic sauce on top and enjoy it while it’s hot.
