Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel.
There’s something undeniably comforting about a warm, gooey blondie fresh from the oven. When these chewy chocolate chip blondies are topped with a crunchy oatmeal cookie streusel, you’ve got a sweet treat that’s perfect for any occasion. These blondies are not only easy to whip up, but they also promise to please a crowd, making them an excellent choice for gatherings, potlucks, or just a cozy night in.
Let’s dive into why these blondies are a must-bake and how you can create this delightful dessert in your own kitchen!
Why It’s Crowd-Pleasing

These Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel are a hit for several reasons:
- Texture: The chewy blondie base combined with the crunchy streusel creates a delightful contrast that everyone loves.
- Flavor: Rich brown sugar, buttery goodness, and chocolate chips come together to create an irresistible flavor profile.
- Versatility: These blondies can be served warm with ice cream for a decadent dessert or enjoyed at room temperature as a snack.
- Easy to Make: With simple ingredients and straightforward steps, this recipe is approachable for bakers of all levels.
What We’re Using
To make these delightful Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel, you’ll need the following ingredients:
- 12 tablespoons unsalted butter, browned
- 1 cup loosely packed brown sugar
- 2 teaspoons vanilla extract
- 2 large eggs, lightly beaten
- 1 3/4 cups all-purpose flour
- 1/2 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1 cup chocolate chips
- 2/3 cup rolled oats
- 2/3 cup loosely packed brown sugar (for the streusel)
- 2/3 cup all-purpose flour (for the streusel)
- 1/4 teaspoon ground cinnamon
- 5 tablespoons unsalted butter, softened (for the streusel)
Toolbox for This Recipe
Before you get started, make sure you have the following tools handy:
- Mixing Bowls: For combining wet and dry ingredients.
- Measuring Cups and Spoons: Precision is key in baking.
- Whisk: To mix your ingredients smoothly.
- Baking Pan: A 9×13 inch pan works perfectly for this recipe.
- Spatula: For spreading the batter evenly in the pan.
- Oven Mitts: Safety first when handling hot pans!
Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel. Cooking Guide

Now, let’s get into the heart of the matter—making these delicious blondies!
Step 1: Preheat Your Oven
Start by preheating your oven to 350°F (175°C). Line your 9×13 inch baking pan with parchment paper for easy removal later.
Step 2: Brown the Butter
In a medium saucepan over medium heat, melt 12 tablespoons of unsalted butter. Continue to cook it, stirring frequently, until it turns golden brown and has a nutty aroma. Once done, remove from heat and let it cool slightly.
Step 3: Combine Wet Ingredients
In a large mixing bowl, whisk together the browned butter, 1 cup of loosely packed brown sugar, and 2 teaspoons of vanilla extract until well combined. Add in the 2 lightly beaten eggs, mixing until smooth.
Step 4: Mix Dry Ingredients
In another bowl, sift together 1 3/4 cups of all-purpose flour, 1/2 teaspoon of baking powder, 1/2 teaspoon of baking soda, and 1/4 teaspoon of salt. Gradually add the dry mixture to the wet ingredients, stirring until just combined. Avoid overmixing!
Step 5: Fold in the Chocolate Chips
Gently fold in 1 cup of chocolate chips, distributing them evenly throughout the batter.
Step 6: Prepare the Oatmeal Cookie Streusel
In a separate bowl, combine 2/3 cup of rolled oats, 2/3 cup of loosely packed brown sugar, 2/3 cup of all-purpose flour, and 1/4 teaspoon of ground cinnamon. Cut in 5 tablespoons of softened butter until the mixture resembles coarse crumbs.
Step 7: Assemble and Bake
Spread the blondie batter evenly into the prepared baking pan. Sprinkle the oatmeal cookie streusel mixture generously over the top.
Step 8: Bake
Place the pan in the preheated oven and bake for 25-30 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out with a few moist crumbs.
Step 9: Cool and Slice
Once baked, remove the blondies from the oven and let them cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. Once cool, slice into squares and serve!
Smart Substitutions

If you find yourself missing an ingredient or two, here are some smart substitutions:
- Use coconut oil instead of unsalted butter for a dairy-free version.
- Substitute almond flour for all-purpose flour for a gluten-free option.
- Swap in dark chocolate chips for a richer flavor.
- Use maple syrup in place of brown sugar for a different sweetness profile.
Method to the Madness
The beauty of these Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel lies in their simplicity. By browning the butter, you introduce a depth of flavor that elevates the blondies beyond the ordinary. The combination of chocolate, oats, and a hint of cinnamon in the streusel adds a delightful twist that keeps you coming back for more.
This recipe is all about layering flavors and textures. The blondie base is soft and chewy, while the streusel on top provides that perfect crunch. Together, they create a harmonious dessert that is sure to impress.
Refrigerate, Freeze, Reheat
These blondies store beautifully, making them a fantastic make-ahead treat.
- Refrigerate: Store any leftovers in an airtight container in the refrigerator for up to a week.
- Freeze: For longer storage, freeze the blondies in a single layer, then transfer to a freezer-safe bag. They can be frozen for up to 3 months.
- Reheat: To enjoy a warm blondie, simply pop it in the microwave for a few seconds or reheat in the oven at 350°F until warmed through.
Troubleshooting Q&A
What if my blondies are too dry?
If your blondies come out dry, it may be due to overbaking. Keep an eye on them during the last few minutes of baking, and remember that they will continue to cook slightly after being removed from the oven.
Can I use different types of chocolate chips?
Absolutely! Feel free to use white chocolate chips, milk chocolate, or even butterscotch chips depending on your preference.
What if I don’t have rolled oats?
If you don’t have rolled oats, you can use quick oats, but the texture will be slightly different. The streusel may not be as crunchy, but it will still taste great!
How can I make these blondies more decadent?
For an extra indulgent treat, add a swirl of peanut butter or Nutella on top of the blondie batter before baking. You can also mix in nuts for added crunch!
Quick Weeknight Wins
If you’re looking for more quick and delicious recipes to try, consider these:
- Easy Weeknight Pasta – A one-pan wonder that’s ready in minutes.
- 30-Minute Mexican Quinoa – A healthy, flavorful dish that’s perfect for busy nights.
- Chewy Chocolate Chip Cookies – A classic recipe that never disappoints!
Time to Try It
Now that you have all the details on how to make these Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel, it’s time to gather your ingredients and get baking. Whether you’re serving them at a gathering or enjoying them solo with a cup of coffee, these blondies are sure to become a favorite in your recipe collection.
Happy baking, and enjoy the deliciousness of these chewy treats!

Chewy Chocolate Chip Blondies with Oatmeal Cookie Streusel.
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C) and line a 9x13 inch baking pan with parchment paper.
- In a medium saucepan over medium heat, melt 12 tablespoons of unsalted butter, cooking until golden brown and nutty in aroma. Remove from heat and cool slightly.
- In a large mixing bowl, whisk together the browned butter, 1 cup of loosely packed brown sugar, and 2 teaspoons of vanilla until well combined. Add in the 2 lightly beaten eggs, mixing until smooth.
- In another bowl, sift together 1 3/4 cups of all-purpose flour, 1/2 teaspoon of baking powder, 1/2 teaspoon of baking soda, and 1/4 teaspoon of salt. Gradually add this dry mixture to the wet ingredients, stirring until just combined.
- Gently fold in 1 cup of chocolate chips, distributing them evenly throughout the batter.
- In a separate bowl, combine 2/3 cup of rolled oats, 2/3 cup of loosely packed brown sugar, 2/3 cup of all-purpose flour, and 1/4 teaspoon of ground cinnamon. Cut in 5 tablespoons of softened butter until the mixture resembles coarse crumbs.
- Spread the blondie batter evenly in the prepared baking pan, then sprinkle the oatmeal cookie streusel mixture generously over the top.
- Bake in the preheated oven for 25-30 minutes, or until the edges are golden brown and a toothpick inserted comes out with a few moist crumbs.
- Once baked, cool in the pan for about 10 minutes before transferring to a wire rack to cool completely. Slice into squares and serve!
Notes
- Store leftovers in an airtight container in the refrigerator for up to a week.
- Freeze blondies in a single layer, then transfer to a freezer bag for up to 3 months.
- Reheat in the microwave or oven for a warm treat!
