Name: Easy Strawberry Rhubarb Cake Recipe
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: American
Ingredients: 14.25 ounces white cake mix (or other white cake mix for 9x13 inch pan); Eggs (as per box instructions, typically 2 large whole eggs); Oil (as per box instructions, typically 1/3 cup vegetable oil or similar); Water (as per box instructions, typically 1 cup); 2 cups mini marshmallows; 3 cups rhubarb, washed and cut into 1/2 inch pieces; 1 cup sugar; 1 cup water; 3 ounces Strawberry Jell-O (1 package, or substitute Raspberry flavor)

Jump to Recipe· 4.2 from 4 reviews

If you’ve been longing for that perfect balance of tart and sweet in a dessert that’s effortless to pull together, you’re in for a treat with this Easy Strawberry Rhubarb Cake Recipe. Imagine a fluffy white cake layered over gooey mini marshmallows and topped with a luscious strawberry-rhubarb compote that makes every bite sing. It’s a nostalgic comfort with a fresh twist, ideal for sharing with family or surprising guests with a dessert that tastes far more complicated than it actually is.

Ingredients You'll Need

The image shows a square piece of cake sitting on top of a stack of five white plates. The cake has two layers: the bottom layer is a moist red fruit or berry filling, and the top layer is a golden brown airy cake with a slightly crispy, textured surface. In the background, there is another identical piece of cake on a white plate with a silver fork beside it, and a rectangular glass baking dish with more of the cake inside. The setting is on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

These simple, everyday ingredients come together in such a way that the flavors and textures beautifully complement each other, creating a cake that’s moist, fruity, and wonderfully satisfying.

Mini marshmallows (2 cups): This unexpected base melts into a sweet, creamy layer that adds moisture and a slight chewiness to the cake.
Rhubarb (3 cups, cut into ½ inch pieces): Tart and tangy, rhubarb balances the sweetness perfectly while adding a lovely pink hue to the topping.
Sugar (1 cup): Sweetens the rhubarb compote and helps to soften the sharpness of the rhubarb.
Water (2 cups total): Essential for dissolving sugar and Jell-O to create the compote and to mix the cake batter as per instructions.
Strawberry Jell-O (3 ounces, 1 package): Adds a delightful berry flavor and helps thicken the rhubarb topping; raspberry works well, too, if you want a twist.
White cake mix (14.25 ounces): The base of the cake, keeping it light and fluffy, making the process straightforward and quick.
Eggs (quantity per box instructions): Helps bind the cake ingredients and add richness.
Oil (amount per box instructions): Keeps the cake moist and tender.

How to Make Easy Strawberry Rhubarb Cake Recipe

Step 1: Prepare the Marshmallow Base

Start by lightly greasing a 9x13-inch baking dish with oil to prevent sticking. Then, spread the mini marshmallows evenly across the bottom. This layer will melt and create a luscious, soft foundation for the cake – trust me, it’s pure magic watching it transform in the oven.

Step 2: Mix and Pour the Cake Batter

Follow the packaging instructions on your white cake mix using eggs, water, and oil as directed. Once your batter is ready, pour it gently over the marshmallow layer, spreading it out evenly so every bite has that perfect cake-to-marshmallow ratio. This simple step is key to getting the texture just right.

Step 3: Make the Rhubarb Strawberry Compote

In a medium-large saucepan, combine the rhubarb, sugar, and one cup of water. Bring the mixture to a steady boil, allowing the rhubarb to soften and release its flavors. Stir in the strawberry Jell-O powder until fully dissolved; this thickens the compote and gives it that bright, fruity taste that complements the cake so beautifully. You can pour this warm over the batter immediately or let it cool a bit if you prefer.

Step 4: Bake and Cool

Place the baking dish in a preheated oven at 325°F and bake for 45 minutes. Baking gently infuses the cake with the fruit topping flavors while the marshmallows melt and combine with the cake. When done, allow it to cool slightly so the layers set and slicing becomes easier. The aroma alone will have you reaching for a fork!

How to Serve Easy Strawberry Rhubarb Cake Recipe

A single square piece of cake is shown on a white plate, resting on a stack of similar white plates, all on a white marbled surface. The cake has two layers: the top layer is light golden-brown and slightly crispy with a bumpy texture, and the bottom layer is soft and beige with a moist look. Between these layers, there is a thick bright red fruit layer that looks juicy and slightly chunky, oozing a little onto the plate. In the background, part of a glass baking dish with more of the same cake is visible, with its golden top layer slightly blurry. A gold fork lies on the right side of the plate next to the cake. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Elevate this cake by dusting it with a light sprinkle of powdered sugar or topping each slice with a dollop of freshly whipped cream. For a fresh touch, scatter some sliced strawberries or a few mint leaves on top to add color and an extra hint of brightness.

Side Dishes

This cake pairs wonderfully with a simple cup of hot tea or freshly brewed coffee, making it a comforting afternoon snack or a delightful finish to a casual dinner. For a more indulgent treat, a scoop of vanilla ice cream on the side is sumptuous and cooling alongside the warm cake.

Creative Ways to Present

Try serving the cake in individual glass jars with layers of cake and compote visible through the glass – it’s an inviting display perfect for parties. Alternatively, cut into small squares and serve on a pretty platter for casual gatherings, or set alongside fresh berries and edible flowers for a stunning centerpiece.

Make Ahead and Storage

Storing Leftovers

Store any leftover cake in an airtight container at room temperature for up to two days or refrigerate it if you prefer your dessert chilled. The flavors meld beautifully overnight, making the next day’s slice even tastier.

Freezing

You can freeze slices separately wrapped in plastic wrap and placed in a freezer-safe container for up to three months. When ready, thaw in the refrigerator overnight for the best texture and flavor preservation.

Reheating

To reheat, warm the cake gently in the oven at 300°F for about 10-15 minutes or microwave individual slices for 20-30 seconds. This brings back the soft, gooey texture, especially the marshmallow layer, making it feel freshly baked again.

FAQs

Can I use fresh strawberries instead of strawberry Jell-O?

While fresh strawberries add a wonderful flavor, the strawberry Jell-O is essential for thickening the compote and giving it that vibrant, glossy finish. You could combine fresh strawberries with a bit of gelatin as a substitute for a natural alternative.

Is it okay to use frozen rhubarb?

Absolutely! Frozen rhubarb works well as long as you thaw and drain it before cooking. This helps avoid excess moisture that could alter the cake’s texture.

Can I make this cake gluten-free?

Yes, by swapping the white cake mix for a gluten-free alternative, you can enjoy this recipe with dietary accommodations. Just be sure the cake mix uses similar quantities of eggs, oil, and water for consistent results.

Why do we use mini marshmallows in the cake?

The mini marshmallows melt and create a moist, sweet layer that enhances the texture and adds a delightful gooey surprise at the bottom. It’s a creative twist that gives the cake its charm.

Can I substitute the white cake mix with homemade batter?

Yes! A homemade white cake batter will work beautifully here and allow you to control ingredients further, especially if you want to adjust sweetness or fat content.

Final Thoughts

This Easy Strawberry Rhubarb Cake Recipe is one of those wonderful desserts that brings together simple ingredients with incredible results you’ll want to make again and again. Whether you’re baking for a special occasion or simply craving something sweet with a little tang, this cake is sure to become a cherished favorite in your kitchen. Grab your ingredients and get ready to enjoy every delicious bite!