1. – Preheat oven to 350°F and grease a 9×13 inch baking pan.

2. – In a large bowl, prepare the cake mix according to package instructions, using the milk and melted butter.

3. – Pour the batter into the prepared baking pan.

4. – In a medium saucepan, combine the brown sugar and pecans. Cook over medium heat, stirring constantly, until the sugar is melted and bubbly.

5. – Carefully pour the sweetened condensed milk over the top of the warm cake.

6. – Spoon the brown sugar-pecan mixture evenly over the top of the cake.

7. – Bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.

8. – Allow the cake to cool completely before serving.