Preheat the oven to 350F then line an 8x8 inch pan with parchment paper.
Prepare brownie mix according to package instructions.
Pour batter into the prepared baking pan and bake according to the package instructions. Use a toothpick to check for doneness. You want to insert the toothpick in the center of the brownie and have it come out with only a few crumbs.
Cool brownies completely in the pan on a wire rack
Make the chocolate ganache
Heat the whipping cream and butter together in a large measuring cup in the microwave for 1-2 minutes. We want it steamy but not boiling.
Pour it over your chocolate chunks or chips and allow it to melt for about 4-5 minutes before whisking everything together.
Feel free to pop the chocolate ganache in the microwave for 15-second increments if it still isn't fully melted.
Top the cooled brownies with the strawberries then the chocolate ganache and allow the brownies to chill in the fridge for 2-3 hours before slicing into them with a sharp warmed up knife.
Notes
How can I get the perfect brownie slices every time?
My best trick is to use a very sharp knife. Keep it in a tall glass of hot water then clean it with a paper towel before slicing it into your brownies.
Make sure to dip your knife in the hot/warm water in between each slice then clean it well so that you make sure that your slices through that decadent chocolate ganache always come out clean and SHARP!