Mix all of that together and spray your brownie pan.
Put half of the brownie mix into the pan
Then put the three hershey bars in. (you can leave them whole or break them up)
Pour the rest of the brownie batter over the candy bars.
Put in a preheated oven on 350F
I dont measure the baking time of my brownies, the way I know they are finnished, I take a toothpick and put it into the middle of the brownies, if it comes out runny or with batter on it, they aren't done, but if it comes out with a "cakey", or dryer texture they are finnished.
Cut the brownies according to how you want to
This is optional: take confectioners sugar and sprinkle it over the brownies, you can put as less or much as you want.