Preheat the oven according to the brownie mix package directions. Line a baking pan with parchment paper or lightly grease it.
Cook the bacon until crisp. Transfer it to a paper towel-lined plate and allow it to cool completely. Crumble into small pieces.
Prepare the brownie batter according to the package directions.
Fold most of the crumbled bacon into the batter, reserving a small amount for the top.
Spread the batter evenly into the prepared pan.
Sprinkle the remaining bacon over the batter. If desired, add a light sprinkle of flaky sea salt.
Bake according to the package directions, adding a few extra minutes if needed, until a toothpick inserted near the center comes out with a few moist crumbs.
Cool completely in the pan before slicing and serving.
Notes
Crisp bacon works best in this recipe because it stays crunchy after baking.
Fold the bacon into the batter instead of layering it on top to distribute the flavor throughout the brownies.
A teaspoon of maple syrup can complement the sweet-and-savory flavor combination.
For the richest results, choose a fudge-style brownie mix. Store brownies in an airtight container at room temperature for up to 3 days or refrigerate for up to 1 week.