Peanut Butter Sheet Cake Brownies

 Can you say YUM??  Ok, we all know I have a peanut butter obsession, but I can honestly say even if you don't, you will LOVE these!!  Just look at how ooey gooey these things are!  And it doesn't have that dry, stick to the top of your mouth peanut butter, it is a really smooth and  melt in your mouth texture!  A must try!  I brought these to a ward party and then to a BBQ and had many people asking for the recipe,  so here goes.  And the sad thing is, I've had this recipe hanging out on my email that my sister sent me months ago to try and it took me this long to get to them!!  There is also another recipe floating around pinterest, but after looking at the ingredients of them both, this one  won my heart!!

Cake:
1/4 Cup creamy peanut butter
1 Cup Water
1/2 Cup butter
1 Cup Sugar
1 Cup Brown sugar
2 Cups Flour
1 tsp salt
1 tsp baking soda
2 eggs
1/2 Cup buttermilk
1 tsp vanilla

Frosting:
3/4 Cup butter
6 TBLSP buttermilk
1/2 Cup peanut butter
3 1/2 Cup powdered sugar
1 TBLSP vanilla

Preheat Oven to 375*,  In a medium pot add the Peanut butter, water and butter and bring to a boil..  Remove from heat.  In a seperate mixing bowl, mix the sugars, flour, salt and baking soda.  Add the peanut butter mixture to it and mix well.  Add in the eggs, buttermilk and vanilla and mix well.
Pour into a gread cookie sheet pan with an edge.  Bake for 15 minutes.

For the Frosting:  in a small pot bring the butter, buttermilk and peanut butter to a boil.  Remove from heat and add the powdered sugar and vanilla.  Whip it really good and fast to make it creamy rather than runny..  Let the cake rest for about 15 minutes, then pour the frosting over the warm cake and spread.