Gluten Free Strawberry Upside Down Cake - This strawberry upside down cake combines a soft vanilla sponge with a layer of juicy strawberries – and it’s super easy to make! It’s a one-bowl recipe and unlike many other upside down cake recipes, you don’t have to make a caramel: instead, the natural juices from the strawberries mingle with the sugar in the oven to create the most delicious strawberry syrup. Strawberry cake. Summer dessert ideas. Strawberry recipes. Gluten free cake recipes.