Heat the milk in the microwave on High 1 minute till there are just bubbles forming around the edge. Be careful not to boil it over. Let the milk cool for about 10 minutes til it is warm to your finger tip. (110 - 120 F).
Sprinkle the yeast and 1 teaspoon of the sugar into the milk and stir well. Let stand about 10 minutes til foamy and bubbly,
Manual Method: Mix the flour and remaining sugar in a bowl. Cut in the butter with a pastry blender until the flour looks mealy. Add the yeast and eggs and stir with a wooden spoon til you have a moist, thick dough. Beat with a dough hook or by hand for approximately 5 minutes. Dough should be very stretchy. Transfer dough to a clean bowl and sprinkle with 1 tablespoon flour. Cover and let it rise until doubled - about 1 hour.
Bread Machine Method: Mix the flour and remaining sugar in a bowl. Cut in the butter with a pastry blender until the flour looks mealy. Whip the eggs lightly and stir into the yeast mixture. Add the yeast mixture to your bread machine and add the flour mixture on top. Start dough cycle. Continue with instructions below when dough cycle has finished.
Butter a 13" X 18" baking sheet.
Transfer dough to a lightly floured surface. Roll it out lightly till it is about ¼" thick. Move to the buttered pan and push out to fill the pan. Do not form an edge crust.
Cover with a kitchen towel.
Mix the Streusel Topping ingredients except the sugar for sprinkling. Pulse in a food processor or work with a pastry blender until mixture is crumbly. Do not process beyond the 'crumb' stage.
Uncover the dough. Press the crumb topping between your fingers to get pea-size lumps. Sprinkle them evenly over the dough.
Cover the dough and topping with the towel and let rise a further 20 minutes.
Preheat oven to 350 degrees F.
Uncover the kuchen and place pan in the oven. Bake 30 minutes and check with a toothpick. Toothpick should come out clean. Remove from oven and sieve icing sugar over the kuchen while it is hot. (Note -I check mine after 15 minutes. If dough is getting too dark cover lightly with a sheet of parchment paper).
Cool on a wire rack. Cut into portions and serve. See Notes.