Halve the zucchini lengthways, remove some of the pulp with a spoon. Cook the zucchini halves for about 5 minutes, drain, season and let steep for 15 minutes.
Cut the onion into fine cubes, cut the boiled ham into strips. Skin, core and chop the tomato. Mix everything with the cream cheese and milk, season again and stir in the herbs (frozen). Fill the zucchini halves with it and place in a buttered casserole dish. Bake in a hot oven at 200 ° C top / bottom heat for about 20 minutes.