Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4). Peel and chop the onion. Peel, wash and finely chop the carrot. Sauté both in 1 tbsp. butter. Steam peas briefly
Boil 3/8 l water with 1/4-1/2 teaspoon salt. Grease an ovenproof dish. Pull the boiling water from the stove. Add 1/8 l milk and 1 tablespoon butter. Stir in the purée. Let it swell for about 1 minute
Mix the eggs and 2 tablespoons of milk and season well. Season vegetables to taste. Stir the puree 1x and spread it in the casserole dish. Spread vegetables, bacon and cheese on top
Pour the egg milk over the casserole and bake in a hot oven for about 15 minutes until golden brown