preheat oven 350°F

combine butter, sugar, peanut butter, vanilla in large bowl

mix in eggs one at a time till creamy

in medium bowl stir together flour, salt, and coca

mix dry mixture slowly to wet mixture till well combined

stir in chopped peanut butter cups

spread brownies into greased 9 x 13" baking dish

evenly sprinkle packaged reeces pieces over top of brownies

bake for 25 - 30 minutes