Peel the garlic. Wash the champagnes and dab them dry. Clean and wash the tomatoes and spring onions. Cut spring onions into large pieces.
Heat oil in a pan. Fry the garlic, mushrooms, tomatoes and spring onions for about 1 minute, turning them over. Season with salt and pepper. Place the pasta and spinach casserole with the vegetables in an ovenproof dish and bake in a preheated oven (electric range: 225 ° C/ gas: level 4) for approx. 20 minutes