Found this one on allrecipes.com.
Strawberry Upside Down Cake
Yellow cake mix (and ingred. listed on pkg)
2 cups crushed strawberries (I used a potato masher)
6 oz. pkg of strawberry jello powder
3 cups mini marshmallows
Preheat oven to 350. Spray pan with non-stick cooking spray. Crush strawberries in a 13x9 pan with a potato masher, distribute evenly. Sprinkle jello powder over strawberries evenly. Add marshmallows to top. Mix cake mix as directed on package. Pour over marshmallows evenly. Bake for about 40-50 min. until toothpick in center comes out clean. The recipe calls to turn this out on a plate after 10 min. (to turn it right side up) but we just left it in the pan and served it out like that.
Our Review: This is excellent!!! Everyone had seconds and then the next day Brooke finished it off. I didn't even get a picture b/c it was all gone so quickly! Brooke even asked for this for her b-day instead of her normal ice cream cake from DQ! We served this warm...a scoop of ice cream or cool whip on top would be especially yummy!!!