Gently beat 3 or 4 eggs. stir in the cheese.
Frylight a quiche dish / pie tin / cake tin or similar
put your prepared ingredients in the tin (I would soften the onions and peppers, and I assume the prawns are cooked)
Pour over the egg/cheese mixture
Personally I would 'float' slices of tomato on the top, but they could just as easily be chopped and added with the other ingredients.
Bake in a 180 - 200 deg oven for about 20 - 30 minutes until set and golden.