Easy Mango Oatmeal Crumble Bars – Buttery Fresh Mango Dessert

Mango Oatmeal Crumble Bars are the perfect buttery fruit bars loaded with sweet, juicy fresh mango and topped with a golden oat crumble that doubles as the crust. These easy Mango Oatmeal Crumble Bars come together with just 10 minutes of prep, making them ideal for summer baking, casual gatherings, or a simple family dessert. With a soft, jammy mango layer nestled between a rich oatmeal crust and crumbly topping, this mango dessert bar recipe delivers the perfect balance of sweet fruit flavor and buttery texture. Whether you’re looking for fresh mango recipes, easy fruit crumble bars, or a make-ahead dessert that slices beautifully, Mango Oatmeal Crumble Bars are guaranteed to become a family favorite.

Introduction

There’s something irresistible about a dessert that feels both rustic and special at the same time. Mango Oatmeal Crumble Bars capture that magic perfectly. They’re buttery, tender, and layered with vibrant fresh mango that practically glows once baked.

What makes these bars especially appealing is their simplicity. The crust and crumble topping are made from the same mixture. That means fewer dishes, fewer steps, and less fuss. You melt the butter, stir everything together, press part of it into the pan, and reserve the rest for the crumbly topping. It’s straightforward and incredibly satisfying.

The mango layer brings brightness and natural sweetness. As it bakes, the fruit softens and thickens into a jammy filling that contrasts beautifully with the oat crumble. These bars are ideal for summer gatherings, lunchbox treats, potlucks, or simply enjoying with a cup of coffee in the afternoon.

They look impressive but require minimal effort, which is exactly what makes them so lovable.

Why You’ll Love This Recipe

• Quick prep: Just 10 minutes to assemble.
• One mixture for crust and crumble: Simple and efficient.
• Fresh mango flavor: Sweet, juicy, and vibrant.
• Perfect texture contrast: Buttery crust, jammy filling, crumbly topping.
• Make-ahead friendly: Stores well and freezes beautifully.
• Beginner-friendly: Straightforward mixing and baking.

Ingredients Breakdown

Servings: 9
Total Time: 2 hours (includes cooling time)
Pan: 8-inch square pan

Crust and Crumble Topping

• ½ cup unsalted butter, melted
• 1 cup all-purpose flour
• ¾ cup old-fashioned whole-rolled oats (do not use quick cook or instant)
• ½ cup granulated sugar
• ¼ cup light brown sugar, packed
• ½ teaspoon salt, or to taste

Ingredient Notes:

• Old-fashioned oats provide structure and texture. Quick oats will make the mixture too dry.
• Brown sugar adds moisture and subtle caramel notes.
• Melted butter binds everything and creates richness.

Mango Layer

• 2 cups coarsely chopped fresh ripe mango (ataúlfo mango used; frozen may be substituted if fully thawed and drained)
• ⅓ cup granulated sugar
• 2 tablespoons lemon juice
• 2 teaspoons corn starch

Ingredient Notes:

• Fresh ripe mango should be sweet and slightly soft to the touch.
• Lemon juice brightens the filling and balances sweetness.
• Corn starch thickens the mango juices during baking.

Tools & Equipment Needed

• 1 (8-inch) square pan
• Aluminum foil
• Cooking spray
• 1 large, microwave-safe bowl
• Mixing spoon or spatula
• Measuring cups and spoons
• Wire rack

Optional:

• Parchment paper as alternative lining
• Offset spatula for even pressing

Step-by-Step Instructions

1. Preheat and prepare pan. Preheat oven to 350°F. Line an 8-inch square pan with aluminum foil and spray with cooking spray. Set aside.
2. Melt butter. In a large microwave-safe bowl, melt ½ cup unsalted butter for about 1 minute on high power.
3. Make crumble mixture. Add 1 cup flour, ¾ cup oats, ½ cup granulated sugar, ¼ cup light brown sugar, and ½ teaspoon salt. Stir to combine. The mixture will be dry and sandy with some larger crumble pieces.
4. Reserve topping. Set 1 heaping cup of the mixture aside for the crumble topping.
5. Form crust. Transfer remaining mixture to the prepared pan. Using a spatula or your fingers, hard-pack the mixture evenly to form a smooth, flat crust.
6. Prepare mango layer. In a large mixing bowl (the same one can be used), combine 2 cups chopped mango, ⅓ cup granulated sugar, 2 tablespoons lemon juice, and 2 teaspoons corn starch. Toss to combine. Undissolved sugar is fine.
7. Add mango layer. Evenly distribute the mango mixture over the crust.
8. Add crumble topping. Evenly sprinkle the reserved heaping 1 cup crumble mixture over the mango. Squeeze the mixture in your palm before sprinkling to encourage larger crumble pieces.
9. Bake. Bake for about 50 minutes, until edges are set and the center has just set. The topping should be pale golden and the mango may bubble at the edges. If mango is very juicy, baking may take 50–55 minutes.
10. Cool completely. Place pan on a wire rack and cool for at least 1 hour before slicing. Cutting too soon will result in messy bars.

Tips & Variations

• Frozen mango: Fully thaw and drain before using.
• Gluten-free option: Substitute all-purpose flour with a gluten-free blend.
• Dairy-free option: Use a plant-based butter substitute.
• Less sweet option: Reduce granulated sugar slightly.
• Add texture: Mix in a handful of chopped nuts (optional).
• Seasonal twist: Combine mango with a handful of berries.

Flavor Profile

Mango Oatmeal Crumble Bars deliver a buttery, slightly crisp base with a tender crumb topping. The mango layer becomes soft and jammy as it bakes, releasing natural sweetness balanced by lemon’s brightness. The oats add chewiness and subtle nuttiness, while the brown sugar contributes depth.

The result is rich yet fresh, sweet but not cloying, and beautifully textured.

Nutritional Overview (Per Serving)

• Calories: 286
• Carbohydrates: 46g
• Protein: 3g
• Fat: 11g
• Saturated Fat: 7g
• Fiber: 2g
• Sugar: 30g

Dietary Notes: Vegetarian. Contains gluten and dairy unless modified.

Make-Ahead & Meal Prep Tips

• Cool completely before storing.
• Store airtight at room temperature up to 1 week.
• Refrigerate up to 10 days.
• Freeze tightly sealed up to 6 months.
• Slice before freezing for easy portioning.

FAQs

Can I use frozen mango?
Yes, thaw fully and drain excess liquid before using.

Why are my bars messy when slicing?
They must cool for at least 1 hour before cutting.

Can I double the recipe?
Use a larger pan and adjust baking time accordingly.

How do I know they’re done?
Edges will be set and topping pale golden.

Can I reduce sugar?
Yes, but it may slightly affect texture.

Cooking Timeline

Prep Time	Cook Time	Additional Time	Total Time	Servings
10 minutes	50 minutes	1 hour cooling	2 hours	9

Serving Suggestions

Slice into even squares for a clean presentation. Serve slightly chilled for firmer texture or at room temperature for softer, more buttery bites. Dust lightly with powdered sugar for a decorative touch. Arrange on a wooden board for rustic charm.

Recipe Variations

1. Tropical Twist: Add shredded coconut to the crumble.
2. Citrus Boost: Add extra lemon zest to the mango layer.
3. Brown Butter Version: Brown the butter before mixing.
4. Mixed Fruit Bars: Replace part of mango with berries.

Ingredient Spotlight

Fresh Mango

Choose mangoes that yield slightly to gentle pressure and smell fragrant near the stem. Ataúlfo mangoes are especially sweet and smooth. Store at room temperature until ripe, then refrigerate.

Old-Fashioned Oats

Use whole rolled oats for proper texture. Quick oats behave like flour and create dryness. Store in an airtight container in a cool pantry.

Pro Cooking Tips

• Press crust firmly for clean slices.
• Watch for bubbling edges as doneness cue.
• Allow full cooling time for structure.
• Use foil lining for easy removal.

Storage & Freezing Guide

• Room temperature: up to 1 week.
• Refrigerator: up to 10 days.
• Freezer: up to 6 months.
• Thaw at room temperature before serving.
• Seal tightly to prevent freezer burn.

Nutrition Estimate Table (Per Serving)

Nutrient	Amount
Calories	286 cal
Protein	3g
Carbs	46g
Fat	11g
Fiber	2g

Dietary Notes: Vegetarian dessert; contains gluten and dairy.

Expanded Conclusion

Mango Oatmeal Crumble Bars are proof that simple ingredients can create something truly special. With their buttery oat crust, sweet mango filling, and golden crumble topping, they offer comfort and brightness in every bite.

Whether you’re baking for family, friends, or just yourself, these bars are easy enough for everyday enjoyment yet impressive enough to share. Save this recipe, bake it when mangoes are at their peak, and let it become a sunny staple in your dessert rotation.

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