Heat oven to 350°F. Coat 9” x 13” pan with non-stick cooking spray.
Prepare brownie mix according to the package directions using the oil, water, and 2 eggs. Spread brownie batter evenly into prepared pan.
Add sweetened condensed milk, 1 egg, and vanilla. Beat until smooth.
45 – 55 minutes or until top is lightly browned and filling is set in the center. Cool completely in pan on a wire rack.
I prepared these brownies in a 9″ x 9″ pan to get a bit more height. This did require a longer baking time. This recipe describes using a 9″ x 13″ pan. If you use a smaller pan adjust your cooking time. Test with a toothpick.
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