Mix the flour, eggs, milk, oil and 1 teaspoon salt with a whisk vigorously to form a thick dough. Bring plenty of salted water to the boil and rub the dough into the water with a dumpling sieve, stir briefly with a wooden spoon so that no lumps form. Let simmer for about 2 minutes, then strain and rinse in cold water.
Heat some butter and briefly fry the bacon cubes in it, add the leek and fry briefly, then add the spaetzle and pour the cream over it. Heat, mix everything well and season with the spices.
Finally stir in the pieces of cheese and serve immediately