Time to get our hands a little dirty! Here’s how you whip up this delightful dessert.

1. Preheat your oven to the temperature specified on the brownie mix box. Prepare the brownie mix as per the instructions, then pour it into a greased baking pan and bake until a toothpick inserted into the center comes out mostly clean.
2. While the brownies are baking, heat the heavy cream in a saucepan over medium heat. Just before it starts to boil, remove it from the heat and pour it over the chocolate chips in a heat-proof bowl. Stir until the chocolate is fully melted and the mixture is smooth.
3. Add the cocoa powder and vanilla extract to the chocolate mixture, stirring to combine. Let it cool to room temperature.
4. Whip the chocolate mixture until light and fluffy to create a mousse texture. This should take about 5-7 minutes using an electric mixer.
5. Once the brownies are done and slightly cooled, cut them into small squares and layer them at the bottom of serving glasses or bowls.
6. Top the brownie layer with the chocolate mousse, followed by a layer of sliced strawberries.
7. Repeat the layers if you have enough space in your serving dish, finishing with a few strawberry slices on top for decoration.

Remember, my kitchen is all about adjusting as you go—if the kids are impatient, a little less chilling of the mousse is perfectly fine!