Imagine waking up to the delightful aroma of freshly baked 5-Ingredient Rhubarb Crumble Breakfast Bars. The warm, tangy rhubarb combined with a sweet, crumbly topping creates a treat that is both satisfying and indulgent. These bars are the perfect balance of flavors and textures—every bite is a little piece of breakfast heaven! I love this recipe because it’s so simple yet so delicious, making it easy to whip up even on the busiest mornings.

I’ll never forget the first time I made these bars. I had a bunch of rhubarb from my garden and didn’t know what to do with it. As I mixed the ingredients, the anticipation built, and when I took that first bite, I was hooked! Now, they’re a staple in my kitchen, and my neighbors often ask for a taste. It’s amazing how a handful of ingredients can create such joy!

Why You’ll Love This 5-Ingredient Rhubarb Crumble Breakfast Bars

This 5-Ingredient Rhubarb Crumble Breakfast Bars recipe stands out for its ease and delightful flavor profile. With just five simple ingredients, you can have a delicious breakfast ready in no time. Plus, it’s a fantastic way to use up that rhubarb from your garden or the farmer’s market. You’ll find yourself making these bars over and over again.

Quick to Make: You can whip these up in just 10 minutes of prep time!
Healthy Ingredients: Packed with oats and rhubarb, they make for a nutritious treat.
Versatile: Enjoy them as a breakfast on-the-go or a sweet afternoon snack.
Perfect for Sharing: With 12 servings, you can share the love (or keep them all to yourself)!
Deliciously Tangy: The rhubarb adds a lovely tartness that balances the sweetness perfectly.

Ingredient Notes & Substitutions

Using quality ingredients makes all the difference in this recipe. Here’s a quick rundown of the key ingredients you’ll need:

Rolled Oats: They provide a hearty base. Look for whole grain oats for the best texture. You can substitute with quick oats if needed, but the texture will be slightly different.
All-Purpose Flour: This helps to bind the ingredients together. You can swap it with whole wheat flour for a nuttier flavor or a gluten-free blend if you’re avoiding gluten.
Brown Sugar: It adds moisture and a rich sweetness. If you’re out, you can use granulated sugar, but it won’t give the same depth of flavor.
Chopped Rhubarb: The star of the show! Fresh rhubarb is best, but you can use frozen rhubarb if fresh isn’t available—just thaw it first.
Unsalted Butter: This enriches the crumble. You can replace it with coconut oil or a dairy-free butter substitute for a vegan option.

How to Make The Perfect 5-Ingredient Rhubarb Crumble Breakfast Bars

Let’s get baking! Follow these steps for perfect 5-Ingredient Rhubarb Crumble Breakfast Bars:

Preheat Your Oven: Start by preheating your oven to 350°F (175°C). This ensures an even bake.
Grease Your Dish: Grab a 9×9-inch baking dish and give it a good greasing—this helps the bars come out easily.
Mix Dry Ingredients: In a large bowl, combine the rolled oats, all-purpose flour, and brown sugar. Stir until everything is well mixed.
Add Butter: Pour the melted butter into your oat mixture and stir until it reaches a crumbly texture. This is where the magic begins!
Press the Crust: Take about half of your mixture and press it firmly into the bottom of your greased dish. This forms the delicious crust.
Add the Rhubarb: Spread the chopped rhubarb evenly over your crust. This adds that lovely tangy flavor.
Top It Off: Sprinkle the remaining oat mixture over the rhubarb. This will bake into a beautiful crumble topping.
Bake Away: Pop your dish in the oven and bake for about 25-30 minutes, or until the top is golden brown and the rhubarb is tender.
Cool and Slice: Once baked, let it cool a bit before slicing into bars. Enjoy your delicious creation!

Expert Tips for Success

Check Your Rhubarb: Make sure the rhubarb is fresh; it should be firm and bright in color.
Don’t Overmix: When combining the ingredients, mix just until combined to keep your bars light and crumbly.
Let Them Cool: Allow the bars to cool completely before slicing to make clean cuts.
Add Nuts: For extra texture, feel free to add chopped nuts into the crumble mix!
Perfect for Meal Prep: You can make these bars ahead of time and store them for a quick breakfast all week!

Variations and Substitutions

Berry Boost: Mix in some fresh or frozen berries with the rhubarb for added sweetness and color!
Spicy Twist: Add a pinch of cinnamon or nutmeg for a warm, spicy flavor in the crumble.
Coconut Flakes: Toss in some shredded coconut for a tropical touch!
Gluten-Free Option: Use gluten-free oats and flour to make this a gluten-free breakfast treat!

Storage and Make-Ahead Instructions

Room Temperature: Store your bars in an airtight container for up to 3 days at room temperature.
Refrigeration: These bars can last up to a week in the fridge if stored properly.
Freezing: You can freeze the bars for up to 3 months. Just wrap them tightly in plastic wrap!
Thawing & Reheating: Thaw overnight in the fridge, and reheat in the oven for a few minutes for that fresh-baked taste.

What to Serve with 5-Ingredient Rhubarb Crumble Breakfast Bars?

Greek Yogurt: Serve with a dollop of yogurt for a creamy contrast that complements the bars perfectly.
Fresh Fruit: Enjoy with a side of fresh berries for a refreshing burst of flavor.
Coffee: A warm cup of coffee pairs beautifully with these bars for a cozy breakfast.
Honey Drizzle: A touch of honey on top can enhance the sweetness and elevate your experience!

FAQs About 5-Ingredient Rhubarb Crumble Breakfast Bars

Can I make this gluten-free?
Absolutely! Just swap the all-purpose flour for a gluten-free blend and make sure your oats are certified gluten-free.
Can I use frozen rhubarb?
Yes, frozen rhubarb works great! Just make sure to thaw it before using.
How do I know when the bars are done?
When the top is golden brown and the rhubarb is tender, they are ready to come out of the oven.
Can I add other fruits?
Absolutely! Feel free to mix in berries or apples for a delicious twist.
How do I store leftovers?
Keep them in an airtight container at room temperature for a few days or in the fridge for up to a week.

5-Ingredient Rhubarb Crumble Breakfast Bars

Print Recipe

This recipe gives you a simple way to enjoy a tasty breakfast. The combination of tangy rhubarb and a crumbly topping makes for a satisfying morning treat. You can easily grab a bar as you head out the door or enjoy it with a cup of coffee at home.

Total Time: 40 minutes
Yield: 12 pieces

Ingredients

2 cups rolled oats
1 cup all-purpose flour
1/2 cup brown sugar
2 cups chopped rhubarb
1/2 cup unsalted butter, melted

Cook Mode Prevent your screen from going dark

Instructions

First, go ahead and preheat your oven to 350°F (175°C). Don’t forget to grease a 9×9-inch baking dish. In a large bowl, combine your rolled oats, flour, and brown sugar. Mix them until they are well combined. Now, pour in the melted butter and stir everything together until you have a crumbly texture. Take about half of this mixture and press it firmly into the bottom of your greased dish to form the crust.
Next, spread the chopped rhubarb evenly over the crust. Then, sprinkle the remaining oat mixture on top. Place the dish in the oven and bake for about 25-30 minutes, or until the top is golden brown and the rhubarb is tender. Once it’s done, let it cool for a bit before you slice it into bars.

Author: Emily Parrison
Prep Time: 10 minutes
Cook Time: 30 minutes
Category: Breakfast
Method: Baking
Cuisine: American