Name: Mango Oatmeal Crumble Bars Recipe
Prep time: 15 min
Cook time: 50 min
Total time: 2 h
Cuisine: American
Ingredients: 1/2 cup unsalted butter (melted); 1 cup all-purpose flour; 3/4 cup old-fashioned whole-rolled oats; 1/2 cup granulated sugar; 1/4 cup light brown sugar (packed); 1/2 teaspoon salt (or to taste); 2 cups coarsely chopped fresh ripe mango; 1/3 cup granulated sugar; 2 tablespoons lemon juice; 2 teaspoons corn starch

Jump to Recipe· 3.9 from 12 reviews

If you’re craving a dessert that feels like a warm hug from the inside out, look no further than this Mango Oatmeal Crumble Bars Recipe. It perfectly balances the tropical sweetness of fresh ripe mangoes with a buttery, oat-filled crumble that’s both chewy and crisp. Each bite is a delightful mixture of juicy fruit, tender crust, and a satisfyingly crumbly topping that will quickly become your go-to snack or dessert for any occasion. Whether you’re an experienced baker or just trying something new, this recipe brings the sunshine to your kitchen in a way that’s simply irresistible.

Ingredients You’ll Need

A clear glass bowl holds mashed yellow fruit mixed with white granulated sugar, with the sugar partly dissolving and creating a wet texture around the fruit. The bowl sits on a white marbled surface. To the left of the bowl, there is a white juicer with a hollowed-out yellow fruit shell placed on it. photo taken with an iphone --ar 4:5 --v 7

Simple, wholesome ingredients come together to create the magic in this Mango Oatmeal Crumble Bars Recipe. Each component plays a crucial role — from the buttery oats in the crust and topping, to the fresh mango filling that adds vibrant color and juicy sweetness.

Unsalted butter (1/2 cup melted): Adds richness and helps bind the crumble for that perfect buttery texture.
All-purpose flour (1 cup): Provides structure to the crust and topping, keeping them tender yet firm.
Old-fashioned whole-rolled oats (3/4 cup): Adds hearty texture and a slight chewiness that makes these bars so comforting.
Granulated sugar (1/2 cup + 1/3 cup): Sweetens both the crumble and mango filling, balancing tartness and enhancing flavor.
Light brown sugar (1/4 cup packed): Gives a subtle caramel note and moisture to the crumble mixture.
Salt (1/2 teaspoon, optional): Elevates all the flavors and balances the sweetness beautifully.
Fresh ripe mango (2 cups, coarsely chopped): The star ingredient providing vibrant taste, tropical aroma, and a juicy burst in every bite.
Lemon juice (2 tablespoons): Adds brightness and prevents the mango from becoming too sweet or flat.
Corn starch (2 teaspoons): Thickens the mango filling so it doesn’t get runny while baking.

How to Make Mango Oatmeal Crumble Bars Recipe

Step 1: Prep Your Pan and Oven

Start by preheating your oven to 350 degrees Fahrenheit. Line an 8-inch square pan with aluminum foil and generously spray it with cooking spray. This simple preparation step makes cleanup a breeze and helps you lift the bars cleanly out of the pan.

Step 2: Melt the Butter

In a large microwave-safe bowl, melt the melted butter. This step infuses the crumble with that irresistibly rich flavor and ensures the oats and flour bind nicely when mixed.

Step 3: Mix the Crust and Crumble

Add the all-purpose flour, oats, granulated sugar, light brown sugar, and salt to the melted butter. Stir everything together until you get a dry, sandy mixture dotted with bigger crumble bits. This texture is key to getting that perfect balance of crisp and tender in your bars.

Step 4: Reserve the Crumble Topping

Set aside one heaping cup of this mixture for the topping. The reserved crumble will add that irresistible crunch on top of your mango layer later on.

Step 5: Form the Crust

Take the remaining crumble mixture and press it firmly into the bottom of your prepared pan. You can use a spatula or your fingers—pressing firmly is essential to create a sturdy base that will hold up to the juicy mango filling.

Step 6: Prepare the Mango Layer

In the same mixing bowl (no need for extra dishes!), combine the fresh chopped mango, 1/3 cup granulated sugar, lemon juice, and corn starch. Toss everything gently to coat—the sugar might not dissolve completely now but will melt into the filling as it bakes, creating a luscious sauce.

Step 7: Assemble the Bars

Evenly spread the mango mixture over your packed crust. Then sprinkle the reserved crumble topping generously on top. For more sizable crumble clusters, try squeezing the topping mixture in your palm before sprinkling—it adds delightful texture to every bite.

Step 8: Bake to Perfection

Bake the bars for about 50 minutes, or until the edges are set and the crumble topping looks pale golden. The mango filling should bubble slightly at the edges. Keep an eye on them—if your mangoes are super juicy, baking might take a bit longer. Trust your eyes over the clock.

Step 9: Cool Before Serving

Once baked, place the pan on a wire rack and let the bars cool completely for at least an hour. This patience pays off because it allows the filling to set properly, making your bars easier to cut and enjoy without a mess.

How to Serve Mango Oatmeal Crumble Bars Recipe

This image shows a close-up of a square dessert bar with three layers. The bottom layer is a firm, crumbly crust that is light brown in color. The middle layer is a smooth, bright orange filling that looks soft and thick. The top layer is a crumbly mixture, golden brown with small clumps and a rough texture, giving it a crunchy look. The dessert bar is set on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Garnishes

These bars are delightful on their own, but adding a dollop of whipped cream or a scoop of vanilla ice cream turns them into something truly special. A sprinkle of toasted coconut flakes or a dusting of powdered sugar can also add a touch of elegance and extra flavor.

Side Dishes

Pairing these bars with a light cup of chai tea or a refreshing green tea enhances their tropical, sweet flavor. For a brunch spread, serve with fresh fruit salad or a creamy yogurt parfait for even more layers of texture and taste that complement the mango oat bars beautifully.

Creative Ways to Present

For an impressive twist, cut the bars into bite-sized squares and serve them as part of a dessert platter alongside other tropical treats. Alternatively, layer chunks of the bars in parfait glasses with Greek yogurt and a drizzle of honey to create a stunning mango crumble parfait.

Make Ahead and Storage

Storing Leftovers

You can keep leftover bars fresh at room temperature in an airtight container for up to one week, which makes them a fantastic grab-and-go snack any day. For longer storage, refrigerate them for up to 10 days, ensuring they stay moist and flavorful.

Freezing

Mango Oatmeal Crumble Bars Recipe also freezes exceptionally well. Wrap them tightly in plastic wrap and aluminum foil before freezing. They keep beautifully for up to six months, so you can bake ahead for busy weeks or special occasions without losing any deliciousness.

Reheating

To enjoy the bars warm, pop a slice in the microwave for about 20 seconds or heat in a preheated oven at 300 degrees Fahrenheit for 5-7 minutes. Warm bars bring out the mango’s aroma and soften the crumble just enough for pure comfort.

FAQs

Can I use frozen mango instead of fresh?

Yes, you can substitute frozen chopped mango. Just be sure to thaw and drain any excess liquid before mixing to avoid a soggy filling.

Is it possible to make this recipe gluten-free?

Absolutely! Use certified gluten-free oats and a gluten-free flour blend in place of all-purpose flour. This swap keeps the chewy texture without compromising taste.

Can I substitute the butter with coconut oil?

You can, but expect a subtle coconut flavor and a slightly different texture—it may be a bit more crumbly. Coconut oil is a great dairy-free alternative that pairs beautifully with mango.

How do I know when the bars are done baking?

Look for a pale golden crumble topping with set edges and slight bubbling of the mango filling along the sides. The center should be mostly set but might have a slight gentle jiggle—this indicates perfect moisture.

What’s the best way to cut these bars?

Allow the bars to cool completely before slicing. Use a sharp, serrated knife for clean cuts. Running the knife under hot water and wiping it dry between cuts can also help achieve neat pieces.

Final Thoughts

I can’t recommend this Mango Oatmeal Crumble Bars Recipe enough — it’s a little slice of tropical sunshine wrapped up in a cozy oat crumble blanket. Whether you’re baking for family, friends, or just yourself, these bars offer that perfect mix of sweet, tart, and buttery that keeps everyone coming back for more. Give it a try and watch how quickly this vibrant dessert makes its way into your regular rotation.