Reese's chewy chocolate cookies

I found this recipe on the bag of my Reese's peanut butter chips and couldn't wait to try it. It turned out so yummy and was SOOOO Easy to throw together!

2 cups all purpose flour
3/4 cup HERSHEY’s cocoa
1 tsp baking soda
½ tsp salt
1 1/4 cups (2 ½ sticks) butter or margarine, softened
2 cups sugar
2 eggs
2 tsp vanilla
1 2/3 cups (10oz) package REESE’S peanut butter chips

Heat oven to 350. Stir together flour, cocoa, baking soda and salt. Beat butter and sugar in large bowl with mixer until fluffy. Add eggs and vanilla; beat well. Gradually add flour mixture, beating well. Stir in peanut butter chips. Drop by rounded teaspoons onto ungreased cookie sheet. Bake 8-9 minutes (don’t over bake; cookies will be soft, they will puff while baking and flatten while cooling) cool slightly; remove from cookie sheet to wire rack. Cool completely; makes about 4 ½ dozen cookies
**Pan recipe: Spread batter in greased 15 ½ x 10 ½ x 1 inch jelly roll pan and bake at 350 for 20 minutes or until set. Cool completely in pan on wire rack and cut into bars