Grease a baking dish with fat. Season the pork schnitzel with salt, pepper, and paprika powder.
Place the schnitzel in the baking dish. Spread the green peppercorns over the top, then sprinkle the grated Gouda and diced mozzarella over the schnitzel.
In a bowl, mix the cream, milk, and white wine. Season with salt and pepper, then pour over the schnitzel and cheese.
Preheat the oven to 180°C (356°F) on convection mode. Bake on the middle rack for 20–25 minutes, until the pork schnitzel reaches an internal temperature of 63°C (145°F).