Wash the herbs, dab dry and, except for some thyme for garnishing, pluck leaves from the stems and chop them. Mix with sour cream and season with salt. Clean the mushrooms and pluck them into pieces.
Cut the bacon slices in half or in thirds. Peel onions and cut into thin rings. Heat 1 tsp. oil in a coated pan. Leave the bacon in it while turning, take it out and let it drip off.
Add 1 tablespoon of oil to the pan and heat. Fry the mushrooms for about 4 minutes, turning them over. After about 3 minutes add onions, fry briefly, season with salt and pepper and remove. Spread flat bread with herb sour cream and cover with mushrooms, bacon and onions.
Crumble cheese over it. Bake in the preheated oven (electric range: 225 °C/ convection oven: 200 °C/ gas: level 4) for 7-10 minutes. Remove the pizza, cut into pieces and garnish with the rest of the thyme.