I started by making the brownie mix according to the box instructions and poured it into the 8″×8″ baking dish. Then I baked it until a toothpick inserted in the center came out with just a few moist crumbs.
After the brownies cooled completely, I removed the stems from the strawberries and cut them in half lengthwise. I arranged them in a single layer on top of the brownie, cut‑side up, so each bite has strawberry in it.
In a microwave‑safe bowl I combined the chocolate chips and heavy cream and microwaved for 25 seconds, stirred, then again for about 20 seconds, and kept stirring until smooth and glossy. You can use a double boiler if you prefer.
I poured the ganache evenly over the strawberries, making sure they were all covered. Then I placed the dish in the fridge for about 20–30 minutes to let the ganache set (it doesn’t harden completely but firms up nicely).
Once chilled, I used a sharp warm knife (I find warming it in hot water helps) to slice into 9 generous squares. You could also cut smaller pieces for more servings.