Add the butter, 1/2 cup stout and corn syrup to a sauce pan. Cook over medium high heat until butter has melted and the mixture has just started to boil.
Turn off heat and stir in 1 cup chocolate chips until completely melted. Allow to cool slightly before using.
Preheat waffle iron according to manufacturers specifications.
In a large bowl add the flour, baking powder, cocoa powder, and salt, stir.
In a microwave safe bowl, add the chocolate chips and milk. Microwave for 30 seconds, stir and repeat until melted. Stir in the beer, vegetable oil, vanilla and only the yolks of the two eggs.
Add the whites to separate bowl, along with the sugar. Whip with a hand mixer until soft peaks form, about 5 minutes.
Make a well in the dry ingredients, add the chocolate milk mixture and stir until just combined. Gently fold into the egg whites until just incorporated.
Cook in waffle iron according to manufacturers specifications, using butter flavored cooking spray if indicated.
Plate waffles, top with desired amount of ice cream, drizzle with chocolate sauce. Serve with a malty stout.