How can you get a dense brownie like the ones individually wrapped?

To achieve a dense brownie similar to those that are individually wrapped, use a recipe that has a higher fat-to-flour ratio, incorporating more butter or oil. Opt for using brown sugar instead of white for added moisture and richness. Bake at a slightly lower temperature for a longer time to ensure a fudgy texture, and avoid overmixing the batter to keep it dense. Additionally, let the brownies cool completely in the pan before cutting to maintain their dense structure.