Easy 3-Ingredient Rhubarb Squares Recipe

When simplicity meets seasonal flavor, you get the magic of these 3-Ingredient Rhubarb Squares. This dessert is a go-to for anyone who loves a tangy-sweet treat without the hassle of a long ingredient list. With only three basic ingredients, these bars come together effortlessly, letting the natural tartness of rhubarb shine through. They are soft, moist, and gently sweet—perfect for springtime gatherings or a quiet afternoon coffee break.

Whether you’re already a fan of Rhubarb Cookies or new to rhubarb recipes, this minimalist take will become a repeat favorite. It’s a wonderful way to celebrate rhubarb season with minimal effort and maximum flavor.

Why You’ll Love These Rhubarb Squares

Minimal Ingredients: Just three main components!
No Mixer Required: Stir together by hand in one bowl.
Moist and Tangy: The condensed milk keeps it soft and rich, while rhubarb adds brightness.
Great for Beginners: A foolproof recipe anyone can master.

Ingredients for 3-Ingredient Rhubarb Squares

Sweetened Condensed Milk: Adds sweetness and creamy moisture that binds the flour and fruit together into a smooth batter.
Self-Raising Flour: Saves time and steps by including both flour and leavening agents.
Fresh Rhubarb: The star of the show—its tart flavor contrasts beautifully with the sweet, creamy base.
Optional Confectioner’s Sugar: A light dusting on top makes for a pretty finish and just a hint of added sweetness.

How to Make 3-Ingredient Rhubarb Squares

Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Grease an 8×8-inch square baking dish or line it with parchment paper for easy removal.

Step 2: Mix the Batter

In a large mixing bowl, combine the can of sweetened condensed milk and self-raising flour. Stir until smooth and well combined.

Gently fold in the diced rhubarb, distributing it evenly throughout the batter. The rhubarb will bake into soft, juicy bits of tartness.

Step 3: Pour and Bake

Pour the batter into your prepared baking dish and spread it evenly with a spatula.

Bake in the preheated oven for 25–30 minutes, or until the top is lightly golden and a toothpick inserted into the center comes out clean.

Step 4: Cool and Dust

Let the bars cool in the baking dish for about 10 minutes, then transfer to a wire rack to cool completely.

Once cool, dust the top with confectioner’s sugar if desired.

Step 5: Slice and Serve

Cut into neat squares and serve as a light, fruity dessert or snack. They’re perfect with a hot cup of tea or coffee.

How to Make 3-Ingredient Rhubarb Squares

Equipment Needed

Mixing bowl
Wooden spoon or spatula
8×8-inch square baking dish
Parchment paper (optional)
Knife for slicing

Tips for Success

Dry Rhubarb Thoroughly: After dicing, pat rhubarb dry with a paper towel to avoid excess moisture.
Don’t Overbake: These squares are meant to be moist, so watch closely near the end of baking time.
Cool Before Cutting: Let the bars cool fully for cleaner cuts and better texture.
Customize It: Add a dash of cinnamon or orange zest for an aromatic twist.

Serving Suggestions

Dust with powdered sugar and top with a dollop of whipped cream.
Pair with a scoop of vanilla ice cream for a spring-inspired dessert.
Serve chilled from the fridge on a hot day for a refreshing treat.

Variations to Try

Add Berries: A handful of chopped strawberries or raspberries would complement the rhubarb beautifully.
Coconut Topping: Sprinkle shredded coconut on top before baking for a tropical note.
Use Gluten-Free Flour: Just be sure it’s self-raising or add a teaspoon of baking powder.
Lemon Drizzle: Replace the confectioner’s sugar with a light lemon glaze.

FAQs about Rhubarb Squares

Can I use frozen rhubarb?

Yes, just thaw and pat it dry thoroughly before folding into the batter.

What if I don’t have self-raising flour?

You can use all-purpose flour and add 1 1/2 tsp baking powder and a pinch of salt.

How should I store the bars?

Keep them in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days.

Can I make this recipe dairy-free?

There are dairy-free sweetened condensed milk alternatives available—try coconut-based ones!

Final Thoughts

These 3-Ingredient Rhubarb Squares are the ultimate answer to “What can I bake fast with rhubarb?” Their simplicity is their brilliance. With just one bowl, a handful of pantry staples, and about 30 minutes of your time, you can bake up a batch of soft, tangy bars that make the most of rhubarb season.

Whether you’re making them for a picnic, afternoon snack, or last-minute dessert, these squares check all the boxes: quick, easy, and absolutely delicious. Try them once, and they’ll find a permanent spot in your spring baking rotation.

Enjoy your baking adventure—and let rhubarb be the star!

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