Mix flour with 1 teaspoon salt in a bowl. Add eggs and about 200 ml water. Beat everything with a wooden spoon (with a hole) until the dough is smooth and bubbles appear. The dough should flow viscously from the spoon, if necessary add some more water.
Coarsely grate both cheeses. Wash the chives, shake them dry and cut into small rolls. Peel onions and slice or cut into thin rings. Heat the lard in a large pan and slowly fry the onions in it until they are brown.
Finally sprinkle with paprika and fry briefly more.
Bring salted water to the boil in a large pot. Put the dough in portions into a spaetzle press. Press into the water and cook for 2-3 minutes. Lift out with a skimmer and drain in a sieve.
Remove some cooking water. Pour half the cheese into a preheated bowl. Pour the hot spaetzle with the cooking water removed onto it. Sprinkle the rest of the cheese on top and mix everything carefully. Season with pepper.
Sprinkle with onions and chives and serve immediately.