Clean the cauliflower and broccoli, divide into florets. Cook in boiling salted water for about 6 minutes. Pour off, collecting some cooking water. Quench vegetables cold. Stir cream cheese with 100-150 ml cooking water until smooth. Dice the tomatoes
Arrange the cauliflower, broccoli and tomatoes in a casserole dish, season with pepper. Spread cream cheese mixture over it. Grate and mix both cheeses
Peel and coarsely grate the potatoes. Mix the grated potatoes with egg, paprika and approx. 1/3 of the cheese mixture. Season with salt and pepper. Spread the hash mixture on the casserole, press on a little. Sprinkle with remaining cheese. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-45 minutes until golden brown. Wash the chives and cut into long rolls. Serve the casserole sprinkled with chives