Apple Crumble Oatmeal Squares

Wholesome Apple Crumble Oatmeal Squares packed with warm cinnamon flavor—ideal for a cozy breakfast, lunchbox treat, or healthy dessert.

Why You’ll Love This Recipe

• Easy to make with simple pantry ingredients
• Great for meal prep—perfect for breakfasts or snacks on the go
• Naturally sweetened with apples and just the right amount of sugar
• Soft and chewy texture with a lightly crisp topping
• Wholesome ingredients like oats, cinnamon, and fresh apples
• Kid-friendly and lunchbox-ready
• No mixer required—just mix, layer, and bake
• Less sugar than traditional desserts without sacrificing flavor
• Freezer-friendly for batch baking
• Versatile for any season with customizable fruit fillings

Ingredients

• 1 1/2 cups rolled oats
• 1 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1/3 cup brown sugar, packed
• 1/2 teaspoon ground cinnamon
• 1/2 cup unsalted butter, melted
• 3 medium apples, peeled and diced
• 2 tablespoons granulated sugar
• 1 tablespoon lemon juice
• 1/2 teaspoon ground cinnamon
• 1/2 teaspoon vanilla extract
• 1 tablespoon cornstarch

Directions

1. Preheat oven to 350°F (175°C). Line an 8×8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
2. In a large bowl, combine the oats, flour, baking soda, salt, brown sugar, and cinnamon.
3. Stir in the melted butter until a crumbly dough forms.
4. Reserve 3/4 cup of the oat mixture for the topping. Press the remaining mixture firmly into the bottom of the prepared pan to form the crust.
5. In a medium saucepan over medium heat, combine the diced apples, granulated sugar, lemon juice, cinnamon, vanilla extract, and cornstarch.
6. Cook for 5–7 minutes, stirring frequently, until the apples begin to soften and the mixture thickens slightly.
7. Spread the apple filling evenly over the crust.
8. Sprinkle the reserved oat mixture evenly over the apple layer.
9. Bake for 30–35 minutes or until the topping is golden and crisp.
10. Let the bars cool completely in the pan before slicing into squares.

Servings And Timing

• Servings: 9 squares
• Prep Time: 15 minutes
• Cooking Time: 35 minutes
• Total Time: 50 minutes
• Calories: Approximately 220 kcal per square

Variations

• Add nuts: Mix chopped pecans or walnuts into the oat topping
• Use different fruits: Try pears, peaches, or mixed berries instead of apples
• Maple twist: Replace brown sugar with maple syrup for a richer flavor
• Vegan option: Use plant-based butter or coconut oil
• Add flax: Stir 1 tablespoon of ground flaxseed into the oat base for a fiber boost
• Spice it up: Add a pinch of nutmeg or clove for deeper spice
• Gluten-free: Use a gluten-free all-purpose flour and certified GF oats
• Coconut topping: Mix shredded coconut into the crumble for added texture
• Lower sugar: Reduce granulated sugar or skip entirely for a less sweet filling
• Protein boost: Add a scoop of unflavored protein powder to the crust mixture

Storage/Reheating

• Room temperature: Store in an airtight container for up to 2 days
• Refrigerator: Keep for up to 5 days in the fridge
• Freezer: Freeze tightly wrapped bars for up to 3 months. Thaw overnight before serving
• Reheating: Microwave individual squares for 15–20 seconds or warm in the oven at 300°F for 5–7 minutes

FAQs

How long does Apple Crumble Oatmeal Squares last in the fridge?

In my experience, store these delicious squares in an airtight container in the refrigerator for 3 to 4 days per USDA food safety guidelines. They also freeze exceptionally well for up to 2-3 months when tightly wrapped. To reheat, simply microwave individual squares for 15–20 seconds or warm them gently in the oven.

Can I substitute butter in this recipe?

I’ve found that you can easily substitute the unsalted butter to make these squares vegan. Plant-based butter or coconut oil are excellent alternatives. Using plant-based butter will maintain a similar texture, while coconut oil might impart a subtle coconut flavor and slightly crispier texture to the crumble.

How long does this need to chill before serving?

The recipe instructs to let the bars cool completely in the pan before slicing into squares. While no specific chilling time is stated, I recommend refrigerating them until firm, at least 2 hours or overnight for the best results, ensuring clean and neat slices.

What goes well with Apple Crumble Oatmeal Squares?

These wholesome Apple Crumble Oatmeal Squares are incredibly versatile. For a cozy breakfast, pair them with a hot cup of coffee or tea. As a dessert, they are delightful with a scoop of vanilla ice cream or a dollop of whipped cream. A glass of cold milk is also a perfect accompaniment.

Is Apple Crumble Oatmeal Squares gluten-free?

This recipe, as written, contains gluten from the all-purpose flour. However, you can easily make it gluten-free by using a gluten-free all-purpose flour blend and ensuring your rolled oats are certified gluten-free. This simple swap allows everyone to enjoy these delicious squares.

Conclusion

Apple Crumble Oatmeal Squares are a nourishing and delicious way to enjoy the comforting flavors of apple pie with the wholesome goodness of oats. Perfect for meal prep, holiday baking, or a sweet afternoon pick-me-up, these bars are easy to make and even easier to love. Keep a batch on hand for a cozy bite any time of day.

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Apple Crumble Oatmeal Squares

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• Author: Chef Mia
• Total Time: 50 minutes
• Yield: 9 squares 1x
• Diet: Vegetarian

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Description

These wholesome apple crumble oatmeal squares feature a soft, spiced apple filling sandwiched between layers of chewy oat crust and golden crumble—ideal for breakfast, snacking, or dessert.

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Ingredients

Scale 1x2x3x

• 1 1/2 cups rolled oats
• 1 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1/3 cup brown sugar, packed
• 1/2 teaspoon ground cinnamon
• 1/2 cup unsalted butter, melted
• 3 medium apples, peeled and diced
• 2 tablespoons granulated sugar
• 1 tablespoon lemon juice
• 1/2 teaspoon ground cinnamon
• 1/2 teaspoon vanilla extract
• 1 tablespoon cornstarch

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Instructions

1. Preheat oven to 350°F (175°C). Line an 8×8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
2. In a large bowl, combine the oats, flour, baking soda, salt, brown sugar, and cinnamon. Stir in the melted butter until a crumbly dough forms.
3. Reserve 3/4 cup of the oat mixture for topping, and press the rest firmly into the bottom of the prepared pan to form the crust.
4. In a medium saucepan over medium heat, combine the diced apples, granulated sugar, lemon juice, cinnamon, vanilla, and cornstarch. Cook for 5–7 minutes, stirring often, until the apples begin to soften and the mixture thickens slightly.
5. Spread the apple filling evenly over the crust.
6. Sprinkle the reserved oat mixture on top.
7. Bake for 30–35 minutes or until the topping is golden and crisp.
8. Let cool completely before slicing into squares.

Notes

• For added texture, mix chopped nuts into the crumble topping.
• Use tart apples for a more balanced flavor profile.
• These squares store well in the fridge for up to 5 days.

• Prep Time: 15 minutes
• Cook Time: 35 minutes
• Category: Snack
• Method: Baking
• Cuisine: American

Nutrition

• Serving Size: 1 square
• Calories: 220 kcal
• Sugar: 14g
• Sodium: 85mg
• Fat: 10g
• Saturated Fat: 6g
• Unsaturated Fat: 3g
• Trans Fat: 0g
• Carbohydrates: 30g
• Fiber: 2g
• Protein: 2g
• Cholesterol: 25mg