Disclaimer: I’ve never played Portal, so forgive me if I’ve mangled any direct references and/or cooking instructions. The font isn’t helping either. Anyway, translation:
 
[louder]Test subject name[/louder]’s test begins now. Cake will be available at the conclusion of the test.
 
….  
10.25 ounces of chocolate mix.  
….  
One can of coconut pecan frosting.  
….  
Vegetable oil, 3/4 of a cup.  
…  
4 large eggs, potato chips, 1 cup.  
…  
Carbonated beverage, 1 cup.  
…  
Sour, 1 cup.  
….  
Please don’t forget the next item.  
….  
Earthworm.