Wash the thyme, shake dry and chop finely, except for a little to garnish. Mix sour cream and thyme, season with salt and pepper. Quarter the peppers, clean, wash and cut into small cubes. Wash and clean the beans and slice them into fine strips with the bean cutter.
Roll out a dough on a baking tray according to the instructions on the package, fold the edges inwards by approx. 0.5 cm and press down firmly. Spread the dough evenly with the sour cream. Spread the beans and peppers over the cream. Bake in a preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: see manufacturer) for approx. 20 minutes until crispy.
Peel onions and cut them into fine rings. Mix flour and paprika powder in a bowl, turn onions in it. Heat the oil in a pan, fry the onion rings until crisp, remove them and let them drip off on kitchen paper.
Take the tarte flambée out of the oven. Prepare the second tarte flambée in the same way. Sprinkle onion rings and remaining thyme over the tarte flambée and serve.