Braise the onions, carrot and rice. Add the mince, spices and pour in a little water after a few min. Once the rice softens, pour the mixture into a tray. Arrange the roasted peppers on top.
To make the sauce, heat the butter and braise the flour in it. Pour in the milk and stir until it thickens. Beat the eggs and add them to the sauce in a thin trickle. Stir well.
Pour the sauce over the peppers and sprinkle 1/2 the cheese on top. Bake at 392°F (200 °C) for about 30 min. Take the dish out of the oven, sprinkle with the remaining cheese and finish baking.