Melt butter, add flour and stir till smooth. Add milk and stir till smooth again. Let cool a bit and chop the spinach coarsely. Mine was quite a bit more coarse than the picture in the book shows. Add egg yolks, spinach, salt, lemon pepper, and baking powder to butter and milk mixture. Fold in the stiff whipped egg whites. Somoth tht dough on greased baking paper adn bake at 200 degrees Celsius. This temp is just under 400 degrees Fahrenheit. Bake 20-25 minutes, cool off under a damp towl (I'm pretty sure I forgot to cool under a damp towl)
Once the roulade has cooled, spread with cottage cheese, crumbled bacon, and blueberry jam. The recipe originally called for only 2 TBS of jam but I added at least that much more cause it looked like it needed it.
Roll roulade, starting at the short end, wrap in plastic wrap and refrigerate till time to eat. Cut into 1 inch pieces and serve with fresh blueberries if desired.