3 1/4 cups milk
1 1/2 cups flour
3/4 tsp salt
toppings of choice (jam, cheese, smoked fish)
Preheat oven to 425 degrees. Line a jelly-roll pan (or similar pan with a thick rim) with overhanging parchment paper, if you have, and grease the parchment paper. Otherwise grease the pan liberally, and hope for the best.
Beat the eggs for several minutes, until thick and light. Mix together the remaining ingredients in a separate bowl, and then mix into the pannukakku. Let the batter rest 10 minutes, then pour into your prepared sheet pan. Bake 30 minutes, until fluffy and lightly golden in some spots. Cut into squares while still warm, and serve.