Clean the peppers, cut into small cubes or diamonds. Finely dice the onions. Sauté both in the hot butter, add the corn and let simmer briefly. Dust with flour, pour stock and milk on top, stir well and cook for 10 minutes. Finally add the creme fraiche and season to taste.
The soup is a lot more calorie-intensive in the original: you then use 600 ml vegetable broth and 500 ml whipped cream instead of milk and creme fraiche - but my guests also liked my light version very much!