Gooey Chocolate Chip Sandwich Bars

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These are just about the best treats I’ve ever made:  Gooey Chocolate Chip Sandwich Bars.  They’re full of gooey chocolate, and that’s a good thing!!

Watch the quick how-to video showing you how to make this recipe, then print out the complete recipe below.

Gooey Chocolate Chip Sandwich Bars

September is Pediatric Cancer Awareness month.  What do these goodies have to do with cancer? The Gooey Chocolate Chip Sandwich Bars come from the “Cookies For Kids Cancer: Best Bake Sale Cookbook.

Gooey Chocolate Chip Sandwich Bars

Cookies for Kids' Cancer

The Cookies for Kids’ Cancer cookbook provides directions on how to hold a bake sale, signage, and lots of recipes and photos. The best part? All of the author’s royalties go directly to help fight pediatric cancer by funding research into new treatments and a cure.

Author Gretchen Holt-Witt founded in 2007 when her two-year old son Liam was diagnosed with pediatric cancer. A few years and a few hundred thousand cookies and bake sales later, this charity has raised millions of dollars to help fun new pediatric cancer treatments.

Kids helping kids… I like that.

Gooey Chocolate Chip Sandwich Bars

These are slab cookies. Made in one pan and lifted out as a slab. 

Cutting Gooey Chocolate Chip Sandwich Bars

They’re a little chocolatey.  SOOO good right out of the pan and warm and gooey, but rather hard to cut.

It’s best to chill them and them cut them neatly.  If you’re into being neat.

Gooey Chocolate Chip Sandwich Bars

So let’s talk about the makeup of these bars.  They’re basically chocolate chip- oatmeal cookie dough spread into the bottom of a pan, then topped with a gooey chocolate layer, then topped with more chocolate chip- oatmeal cookie dough.

I love the sort of natural, rustic crackle look on the tops of the bars.  Gives you a lil’ peek that there is a gooey layer of chocolate hidden in the middle.

Hungry?  Craving chocolate now?  Yeah, I thought so.

Gooey Chocolate Chip Sandwich Bars

And there they are… my “neatly” cut Gooey Chocolate Chip Sandwich Bars.  Chocolate overload, if you like that sort of thing.  Good with milk, if you drink that stuff.  And perfect for a bake sale, where you’ll make big bucks to donate to Cookies for Kids’ Cancer.

I think it’s a great idea for kids to have bake sales for charity– showing them that it’s not all about making money for themselves to purchase their next video game or iTunes gift card or whatever.  There are things much more important in this world.

Here are a few more bar recipes you might enjoy:

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5 from 1 vote

Gooey Chocolate Chip Sandwich Bars

Perfect chocolate chip bar sweet treat!
Prep Time 30 minutes
Cook Time 20 minutes
Servings 32 bars
Calories 336kcal
Course Dessert
Cuisine American
Keyword chocolate chip bars, gooey chocolate chip sandwich bars



  • 2 cups semisweet chocolate chips
  • One 14-ounce can sweetened condensed milk
  • 2 teaspoons vanilla extract


  • 1 cup (2 sticks) unsalted butter, at room temperature
  • 1 cup packed light brown sugar
  • 1/2 cup granulated white sugar
  • 1 large egg
  • 1 large egg yolk
  • 1 tablespoon vanilla extract
  • 2 cups all purpose flour
  • 1 cup quick-cooking or old fashioned rolled oats
  • 1 teaspoon baking powder
  • 1 teaspoon baking soda
  • 1 teaspoon kosher salt
  • 3 cups semisweet chocolate chips


  • Preheat the oven to 350 degrees F. Lightly butter a 9x13-inch pan with parchment paper, allowing enough overhang on the long side to lift the bars from the pan.


  • Place the chocolate chips and condensed milk in a small saucepan over the lowest possible heat and cook, stirring constantly, until the chocolate has melted and the mixture has thickened, 3 to 5 minutes. Turn off the heat, add the vanilla, and stir until smooth. Set aside to cool to room temperature.


  • Place the butter and sugars in a large bowl. Beat with an electric mixer until smooth and creamy. Add the egg, egg yolk and vanilla. Beat well. Whisk together the flour, oats, baking powder, baking soda and salt in a medium bowl. Add to the butter mixture. Beat until everything is well incorporated, scraping down the sides of the bowl as needed. Stir in the chocolate chips.


  • Using half of the batch of cookie dough, place dollops into the prepared pan and press down lightly to even it out. Pour the cooled chocolate mixture over the dough and then add small dollops of the remaining dough on top. Don't worry if the dollops don't completely cover the chocolate mixture. Just spread it together as much as you can, and let some chocolate peek through.
  • Bake until lightly browned, 20 to 25 minutes. Set aside to cool completely, then cut into 32 bars.



  • These are easiest to cut when they have chilled for a while. You'll be able to get nice, clean cuts when they're firmer, then they'll soften up a bit when they're at room temperature again.


Serving: 1g | Calories: 336kcal | Carbohydrates: 39g | Protein: 4g | Fat: 18g | Saturated Fat: 11g | Cholesterol: 34mg | Sodium: 131mg | Potassium: 249mg | Fiber: 3g | Sugar: 27g | Vitamin A: 242IU | Vitamin C: 1mg | Calcium: 70mg | Iron: 2mg
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  • Jennine Krieger wrote:

    Do you know if I could substitute something for the egg and egg yolk? One of my granddaughters is allergic to eggs.

    • Lori Lange wrote:

      I am not knowledgeable about egg substitutes, so I’m not sure. Maybe try Google to find out what is best to substitute egg for in baking?

  • Christine Jefferies wrote:

    Have made these twice now. I didn’t have enough chocolate chips so I used peanut butter chips too and they came out great! Will definitely make these again and again. I like them best refrigerated or even frozen.

  • Ericclynn Crane-Butler wrote:

    I followed directions completely and these did not turn out at all even turned down oven and cooked extra time and still spots were don’t cooked at all and other parts were burning. Vey disappointed wasted 2 bags of chocolate chips and a can of condensed milk don’t think I will try these again

    • Lori Lange wrote:

      I’m not sure what could have happened–this recipe has been around for a long time!

  • Raina wrote:

    So delicious. Dessert chosen for daughter’s wedding.