Chocolate-Peanut Butter Chip Brownies

1 (21 1/2 ounce) package brownie mix
1 cup peanut butter morsels

Prepare brownie mix according to package directions, stirring in peanut butter morsels. Spoon mixture into a greased 13 x 9-inch pan. Bake at 350 degrees F for 33 to 35 minutes. Cool and cut into squares.