Take the dough out of the refrigerator and let it rest for about 10 minutes. Wash the tomatoes, drain well and cut in half. Wash the thyme, remove the leaves.
Unroll the dough and place it together with the baking paper in a rectangular tart tin (approx. 19 x 27 cm). Press up the edge a little. Sprinkle the base with breadcrumbs. Place the tomatoes with the cut surface facing upwards (this way the dough rises better) close together.
Season with salt and pepper. Sprinkle with thyme.
Crumble goat's cheese over the tomatoes. Drizzle everything with oil. Brush the edge of the dough with milk. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 25 minutes. Cover the edges of the dough with aluminium foil if necessary.