Preheat the oven to 180°C.
Put the spinach into a bowl and pour boiling water over it. When it’s wilted, drain and squeeze out the excess water.
Lightly oil an oven-proof dish, then lay the breast fillets in them. Season with salt and pepper and scatter the garlic and your chosen spice (turmeric or cayenne) over it.
Cut the tomatoes into slices and put these on top of the chicken.
Slice the sundried tomatoes and scatter these on top and drizzle with a little oil from the jar.
Chop up the spinach and scatter it on top, making sure it evenly covers the chicken and tomatoes.
Slice the mozzarella and cover the dish with these. Season with some freshly ground pepper and bake in the oven for about 25 minutes, until the cheese has melted and it’s golden brown.
Serve warm.