Mom’s Strawberry Rhubarb Upside-Down Cake

Ingredients

• 5 cups chopped fresh rhubarb
• 3 cups miniature marshmallows
• 1 cup white sugar
• 1 (3 ounce) package strawberry flavored Jell-O®
• 1 (18.25 ounce) package yellow cake mix

Steps

1. Preheat the oven to 350 degrees F (175 degrees C). Grease a 9×13 inch pan.
2. Stir rhubarb, marshmallows, sugar, and Jell-O mix together in a large bowl. Spread evenly in the prepared pan. Mix cake batter according to package directions; pour evenly over ingredients in the pan.
3. Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour. Run a knife around outer edges of cake to loosen; turn out onto a large plate while still hot. Let cake cool before serving.