Puffed Wheat Squares

I got this recipe from my mom and I loved it when she made these when I was a kid.

Puffed Wheat Squares

   -1/3 C Butter           
   -1/2 C Corn Syrup (dark corn syrup works best)
   -1 C Brown Sugar   
   -2 Tbsp Cocoa 
   -1 tsp Vanilla          
   -8 C Puffed Wheat Cereal (plain, not Smacks or Sugar Crisp)

-Mix everything together except cereal in a sauce pan over medium heat and bring to a boil for 2 1/2  to 3 minutes.
-remove from heat and pour over cereal
-press into a greased 9 x 13 pan and let cool.