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Preheat oven to 350°F. Line a 9x9” pan with foil and spray with cooking spray for easy removal.
Add brownie mix, egg, and butter to the bowl of a stand mixer fitted with the paddle attachment. Beat until a thick mixture forms (thicker than cookie dough). You can do this with a hand mixer but it will take a really long time!
Press half the mixture into the bottom of the prepared pan.
Top with the chocolate chips and pour the sweetened condensed milk over the top, but try to not let the milk touch the edges of the pan. (That will cause it to bubble and brown.)
Break pieces of the remaining dough and drop them evenly over the top of the bars, then press gently to compact.
Bake for 35-45 minutes, until the top starts to lose the glossy look.
Cool to room temperature before cutting.
Store at room temperature for maximum gooeyness.