Preheat the oven to 200 degrees C. In a large frying pan over medium heat, saute the sausage, onion and green pepper. Cook for about 10 minutes, until golden.
Spread the sausage evenly over the baskets. Mix eggs and milk, and pour into baskets. Put chopped tomato. Sprinkle with grated cheese.
Bake in a preheated oven for 20 minutes.