Peel the potatoes and cut into slices or cubes. Clean the leek, onion, carrots and bell pepper and cut into bite-sized pieces. Lightly sauté the vegetables in a little margarine or oil. Season well with salt, pepper and paprika. Layer the cheese with the steamed vegetables in a greased baking dish. Whisk the 2 eggs with the milk and a pinch of salt and pour over the vegetables. 35 minutes at 200 ° C in the convection oven or 25 minutes in the 600 watt microwave plus 5 minutes standing time! Important! So only take the casserole out of the microwave after 30 minutes.