Prepare brownie mix according to package directions. Spoon batter into greased and floured 9-inch square pan. Set aside.
Beat Neufchâtel cheese and sugar in bowl of electric mixer until light and fluffy. Add egg and vanilla extract. Beat 30 seconds, scraping down sides of bowl. Drop Neufchâtel batter by tablespoonfuls onto brownie layer. With tip of knife, swirl vanilla into chocolate batter. Bake 45 minutes or until brownies pull away from sides of pan and center is firm. Cool; refrigerate until well chilled before slicing.
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