1Heat oven to 350°F. Spray bottom and sides of 13x9-inch pan with cooking spray.
2In large bowl, stir cookie mix, butter and 1 egg until soft dough forms. Press dough in bottom of pan. Bake 15 minutes.
3Reduce oven temperature to 300°F. In large bowl, beat egg yolks and sugar with wire whisk until well blended; gradually beat in whipping cream and vanilla. Pour over crust. Bake 45 to 50 minutes longer or until knife inserted in center comes out clean. Cool completely, about 1 hour. Refrigerate at least 3 hours before serving.
4Set oven control to broil. Sprinkle top of bar with brown sugar. Broil with top about 5 inches from heat 2 to 3 minutes or until top is brown and sugar is melted. For bars, cut into 6 rows by 4 rows. Store covered in refrigerator.