Mel's Kitchen Puppy Chow

2 c semisweet chocolate chips
1 1/4 c peanut butter
6 T salted butter
1 t vanilla
10 1/2 to 11 cups rice or corn chex (12 oz box) 
2 1/2 c powdered sugar
2 T cocoa powder

Combine chocolate chips, peanut butter, and butter and melt together. Stir in the vanilla. 

Place the cereal in a very large bowl, and pour the chocolate mixture over it. Let the cereal rest for 5-10 minutes, ging from wet and shiny to sticky. 

Whisk together the powdered sugar and cocoa. Put cereal mixture in a large paper bag, sprinkling the sugar mixture on top. Shake shake shake!