Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Clean, wash and slice the mushrooms. Heat oil in a pan. Brown the mushrooms in it. Season with salt and pepper.
Let it cool down a little. Clean, wash and finely dice the peppers. Wash and slice the tomatoes. Dice cheese.
Knead minced meat, ground pork, egg, breadcrumbs, sweet paprika, pizza spice and 1 teaspoon salt. Form 4 flat thalers (approx. 12 cm Ø each) from the mince mixture and place them on a baking tray lined with baking paper.
Top with tomatoes, peppers, mushrooms and mozzarella.
Bake in a hot oven for about 15 minutes. Wash the basil, dab dry and cut into fine strips. Serve pizzas sprinkled with basil.