01 -
Set your oven to 350°F so it's hot and ready when you start baking.
02 -
Make the white cake batter by following the instructions on the box. This should involve mixing it with eggs, oil, and water. Set it aside once it's smooth.
03 -
Grease a 9×13 pan and spread chopped strawberries across the bottom in an even layer.
04 -
Evenly spread the dry strawberry-flavored gelatin mix over the top of the fresh strawberries.
05 -
Scatter mini marshmallows evenly on top of the strawberry and gelatin mixture so they cover the whole pan.
06 -
Pour the prepared cake batter gently over the marshmallows, making sure it completely covers everything below.
07 -
Place the pan in the oven and bake for about 50 minutes. To see if the cake is done, poke the center with a toothpick. It should come out clean (no sticky batter).
08 -
Let the cake rest for 20 minutes to cool slightly. Slide a knife along the sides of the pan to loosen it, then cover the dish with a large plate and carefully flip it over so your cake lands strawberry-side up on the plate.