Nutella Stuffed Oatmeal Cookie Bars Recipe with Gooey Filling

Name: Chocolate Nutella Cookie Bars
Prep time: PT-495060H46M41S
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: – 10 tablespoons unsalted butter (softened); – 3/4 cup light brown sugar (packed); – 2 teaspoons pure vanilla extract; – 1 large egg; – 1 1/3 cup all-purpose flour; – 1 cup old-fashioned rolled oats; – 1/2 teaspoon baking soda; – 1/4 teaspoon salt; – 2/3 cup chocolate hazelnut spread; – 1/2 cup semisweet chocolate chips

By:

Gabriella Brotherton

Published:

September 18, 2025

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Imagine pulling warm, gooey bars from the oven that fill your kitchen with a rich chocolate aroma these Chocolate Nutella Cookie Bars are just that inviting. They’re simple to whip up, taking only about 45 minutes from start to finish, including 15 minutes of prep and 30 minutes of baking. This makes them ideal for busy parents or anyone with a hectic schedule who still wants something homemade.

Beyond the ease, these bars pack in goodness like oats for a hearty texture and chocolate hazelnut spread for a creamy twist, offering a treat that feels nutritious too. With options to adapt for various diets, they’re perfect for food enthusiasts and community gatherings, bringing people together over shared, delicious moments. Whether you’re a student needing a quick snack or a baking enthusiast experimenting in the kitchen, this recipe adds a fun, adaptable element to your routine.

One bite reveals a unique blend of chewy oats and melty chocolate that sets it apart from everyday desserts. These bars travel well for picnics or potlucks, making them a go-to for community organizers and church groups. Plus, they’re versatile enough to tweak based on what you have on hand, ensuring everyone can enjoy them without fuss.

Key Benefits at a Glance

Quick prep time keeps things simple for busy lifestyles.
Nutrient-rich ingredients like oats add fiber and satisfaction.
Easy adaptations mean they’re inclusive for all tastes and needs.
The gooey center creates memorable flavors that delight crowds.

To dive deeper into similar treats, check out our guide to Chocolate Chip Cheesecake Bars for more chocolatey inspiration.

Jump to:

Why You’ll Love This Chocolate Nutella Cookie Bars
Key Benefits at a Glance
Essential Ingredients for Chocolate Nutella Cookie Bars
Main Ingredients List
How to Prepare the Perfect Chocolate Nutella Cookie Bars: Step-by-Step Guide
Finishing Touches
Dietary Substitutions to Customize Your Chocolate Nutella Cookie Bars
More Ideas for Adaptations
Mastering Chocolate Nutella Cookie Bars: Advanced Tips and Variations
Make-Ahead Strategies
How to Store Chocolate Nutella Cookie Bars: Best Practices
FAQs: Frequently Asked Questions About Chocolate Nutella Cookie Bars
How do I make Chocolate Nutella Cookie Bars chewy?
Can I use a different nut butter instead of Nutella in this recipe?
How should I store Chocolate Nutella Cookie Bars to keep them fresh?
Are Chocolate Nutella Cookie Bars suitable for freezing and reheating?
What is the best pan size to bake Chocolate Nutella Cookie Bars?
Chocolate Nutella Cookie Bars
Ingredients
Instructions
Last Step:
Notes
Nutrition
Did you make this recipe?

Gathering the right ingredients is the first step to making these Chocolate Nutella Cookie Bars turn out just right. This recipe focuses on simple, everyday items that blend together for a perfect balance of chewy and chocolatey goodness. Use fresh ingredients for the best results, and measure carefully to avoid any mishaps.

Main Ingredients List

10 tablespoons unsalted butter (softened)
3/4 cup light brown sugar (packed)
2 teaspoons pure vanilla extract
1 large egg
1 1/3 cup all-purpose flour
1 cup old-fashioned rolled oats
1/2 teaspoon baking soda
1/4 teaspoon salt
2/3 cup chocolate hazelnut spread
1/2 cup semisweet chocolate chips

This list covers everything you need for a full batch, ensuring your bars come out with that irresistible gooey filling. For more ideas on baking with oats, you can explore baking tips for bar cookies that might enhance your technique.

Getting ready to bake these Chocolate Nutella Cookie Bars is straightforward and fun, starting with preheating your oven for even cooking. Begin by setting it to 350°F and lining an 8×8-inch pan with foil or parchment paper, then give it a light spray with nonstick spray to prevent sticking. This simple prep ensures your bars lift out easily and keep their shape.

Next, in a large bowl, beat the softened butter and packed light brown sugar until they’re fully combined and creamy this creates the base for that chewy texture. Add the pure vanilla extract and large egg, mixing everything well to incorporate air and flavor. Then, stir in the all-purpose flour, old-fashioned rolled oats, baking soda, and salt until the dough comes together smoothly.

Press a bit more than half of this dough evenly into your prepared pan, and pop the rest in the fridge to chill. Bake the crust for about 12 minutes until it’s set but not fully done. Pull it out, dollop on the chocolate hazelnut spread, spread it lightly with an offset spatula, and sprinkle over the semisweet chocolate chips for that gooey layer.

Finishing Touches

Take the chilled dough, press it into flat pieces, and lay them evenly over the chocolate topping to seal in the goodness. Bake for another 18 to 22 minutes until the top turns golden brown. Let the bars cool completely in the pan before cutting; serve them slightly warm to keep the center melty and irresistible. With a total prep and bake time of 45 minutes, this recipe fits right into a busy day.

Chocolate Nutella Cookie Bars — Nutella Stuffed Oatmeal Cookie Bars Recipe With Gooey Filling 9

One of the best parts of this recipe is how easy it is to tweak for different needs, making it a hit for everyone from diet-conscious folks to families with allergies. Start by swapping the egg with a flaxseed or chia egg if you’re going vegan, which keeps the bars binding together without any fuss. For gluten-free options, use almond flour or chickpea flour in place of all-purpose flour to maintain that hearty texture.

You can also enhance the protein by incorporating nut butters like almond or peanut butter instead of chocolate hazelnut spread, adding a nutty twist that boosts flavor and nutrition. To cut back on refined sugars, try coconut sugar or maple syrup as alternatives, which bring a natural sweetness while fitting low-calorie goals. These changes let you tailor the bars for travelers, seniors, or anyone watching their intake.

More Ideas for Adaptations

Nut-free versions: Swap chocolate hazelnut spread with sunflower seed butter or tahini.
Spice it up: Add a dash of cinnamon for warmth or chili powder for a kick.
Healthier swaps: Use stevia in place of sugar to keep things light and fresh.

Experimenting with these substitutions helps create bars that suit working professionals or newlyweds looking for quick, customizable treats.

Taking your Chocolate Nutella Cookie Bars to the next level involves a few clever techniques that make all the difference. For a smoother batter, try melting the chocolate hazelnut spread and butter together using a double boiler, which blends flavors evenly and prevents lumps. Chilling the dough before baking also helps improve texture, giving you bars that are perfectly chewy without falling apart.

Play with flavors by mixing in chopped nuts for crunch or sea salt flakes for a savory edge, and don’t hesitate to swirl in peanut butter for extra depth. When it comes to presentation, dust the tops with powdered sugar or drizzle on tempered chocolate to make them look as good as they taste these touches impress at gatherings and picnics.

Make-Ahead Strategies

Prepare the batter in advance and store it in the fridge for up to 24 hours, or freeze baked bars wrapped individually for up to a month. This approach works wonders for busy parents and students who need easy grab-and-go options. For baking enthusiasts, these variations turn a simple recipe into something truly special for community events.

Tip Category	Suggestion
Texture Enhancement	Use fresh brown sugar to keep bars chewy
Flavor Boost	Add mix-ins like nuts for variety
Storage	Let cool fully before cutting to avoid mess

Keeping your Chocolate Nutella Cookie Bars fresh means storing them properly to hold onto that gooey center. Keep them in an airtight container at room temperature for up to 3 days, or in the fridge for a week to maintain their soft texture. For longer storage, freeze the bars by wrapping each one in plastic wrap and placing them in a freezer-safe bag they’ll stay good for up to 3 months.

When you’re ready to enjoy them again, thaw at room temperature and warm gently in the microwave for 15-20 seconds or in an oven at 300°F for 5-7 minutes. This method works great for meal prep, letting working professionals or travelers pack these as easy snacks. Remember, adding parchment paper between layers prevents sticking and keeps everything neat.

Storing these bars the right way ensures they taste just-baked every time, making them a reliable choice for quick treats.

How do I make Chocolate Nutella Cookie Bars chewy?

To achieve chewy Chocolate Nutella Cookie Bars, slightly underbake them by removing them from the oven once the edges are set but the center still looks soft. Using brown sugar instead of white sugar and adding an extra egg yolk can also increase moisture and chewiness. Avoid overmixing the dough to keep the texture tender. Let the bars cool completely in the pan before cutting to help them firm up without becoming hard.

Can I use a different nut butter instead of Nutella in this recipe?

Yes, you can substitute Nutella with other nut butters like almond or peanut butter. Keep in mind that these alternatives may change the flavor and texture. Peanut butter, for example, is less sweet and more oily, so you might want to add a bit of honey or sugar to balance taste and adjust the baking time slightly to prevent excess greasiness. Experiment in small batches before making a full recipe swap.

How should I store Chocolate Nutella Cookie Bars to keep them fresh?

Store the cookie bars in an airtight container at room temperature for up to 3 days. For longer storage, place them in the refrigerator, where they will keep for about a week. To maintain softness, separate layers with parchment paper. If freezing, wrap the bars tightly in plastic wrap and aluminum foil; they will last up to 3 months. Thaw at room temperature before serving.

Are Chocolate Nutella Cookie Bars suitable for freezing and reheating?

Yes, Chocolate Nutella Cookie Bars freeze well. After cooling completely, wrap individual bars or the entire batch tightly in plastic wrap, then foil, and place in a freezer-safe container or bag. To reheat, thaw them at room temperature and warm in a microwave for 15-30 seconds or in a preheated oven at 300°F (150°C) for 5-7 minutes to regain softness and a freshly baked texture.

What is the best pan size to bake Chocolate Nutella Cookie Bars?

An 8×8-inch or 9×9-inch square baking pan works best for Chocolate Nutella Cookie Bars. This size allows the bars to bake evenly, creating a perfect thickness—thick enough to hold a chewy center but thin enough to bake through properly. Using a larger pan can result in thinner, crispier bars, while a smaller pan produces thicker, denser bars that may require longer baking times.