01 -
Turn your oven on to 350°F so it can preheat while you prepare everything else.
02 -
Follow the directions on your white cake mix box to prepare the batter. This usually means mixing it with eggs, water, and oil. Set the batter aside for now.
03 -
Scatter your chopped strawberries in an even layer across the bottom of a greased 9×13 baking dish.
04 -
Sprinkle the dry strawberry jello powder all over the strawberries, making sure to cover them evenly.
05 -
Spread the mini marshmallows on top of the strawberry and jello layers, creating an even covering.
06 -
Gently pour your prepared cake batter over everything in the dish, covering all the marshmallows completely.
07 -
Place your dish in the preheated oven and bake for about 50 minutes. To check if it's done, stick a toothpick in the center - it should come out clean without any wet batter.
08 -
Let the cake cool for 20 minutes. Then run a knife around the edges of the pan to loosen it. Place your serving plate upside down on top of the baking dish, then carefully flip everything over so the cake drops onto the plate with the strawberry side up.