These Biscoff Caramel Cookie Bars are chewy oatmeal bars with a gooey salted caramel center. Perfect for parties and potlucks! Get the recipe.

I have a serious soft spot for Biscoff cookie butter, and these Biscoff Caramel Cookie Bars are one of my favorite ways to use it. The base is a chewy oatmeal cookie dough, then a layer of salted caramel, then more dough on top. Bake it all together and you get a bar that’s sweet, salty, and impossibly gooey. Every bite has that warm cinnamon-oat flavor with pockets of rich caramel.

The combo of Biscoff cookie butter and salted caramel creates a deep, butterscotch-like sweetness that you can’t get from plain cookies.
Two layers of oatmeal dough give you a sturdy base and a soft top, while the caramel middle stays gooey after cooling.
These bars are easy to make for a crowd and transport well, so they’re perfect for potlucks or parties.

Biscoff cookie butter, This is the star. It adds a caramelized, spiced flavor that pairs perfectly with oats and cinnamon. You can substitute with Trader Joe’s cookie butter if needed, but don’t use peanut butter, it changes the flavor completely.
Old fashioned oats, They provide the chewy texture. Quick oats will make the bars softer and more crumbly, so stick with rolled oats.
Salted caramel sauce, Homemade or store-bought both work. If you use unsalted caramel, sprinkle a little extra flaky salt on top after baking.

9×13-inch metal or glass baking pan
Stand mixer or hand mixer with beaters
Rubber spatula for scraping the bowl
Sharp chef’s knife for clean cuts

Make sure your butter and Biscoff spread are at room temperature so they cream smoothly with the sugars. If the dough feels too sticky to press, lightly dampen your hands with water or spray them with nonstick cooking spray. That trick makes it much easier to spread the top layer over the caramel without tearing the dough.

The reason these bars stay soft and chewy is the combination of brown sugar and old fashioned oats. Brown sugar has more moisture than granulated, and oats absorb some of that moisture without turning the bars dry. Using a full tablespoon of vanilla also boosts the flavor profile without making the dough wet.

Don’t overmix the dough once you add the dry ingredients, or the gluten will develop too much and make the bars tough. Mix until you can’t see any flour streaks, then stop.

If you want extra crunch, use the crunchy version of Biscoff spread instead of creamy. You can also swap in Trader Joe’s cookie butter, it works just as well. For the caramel layer, homemade salted caramel is fantastic, but a good store-bought brand like Trader Joe’s jarred sauce saves time and still tastes great.

For a different twist, fold half a cup of mini chocolate chips into the dough before pressing it into the pan. The chocolate pairs nicely with the Biscoff and caramel.

Let the bars cool completely before cutting so the caramel sets up properly. If you try to cut them warm, it will be a sticky mess, I know it’s hard to wait, but it’s worth it. Once cool, cut into squares with a sharp knife. You can enjoy them plain, or go all out with a scoop of vanilla ice cream and an extra drizzle of salted caramel sauce. That’s my favorite way to turn these into a full-on dessert.

Store the cooled bars in an airtight container at room temperature for up to 4 days. I like to keep them on the counter so they stay soft and chewy. If you need to stack them, place a sheet of parchment between layers to prevent sticking.

Once the bars are completely cool, cut them into squares and place them in a single layer in a freezer-safe container or bag. Separate layers with parchment paper so they don’t stick. They’ll keep for up to 2 months. When you want a bar, let it come to room temperature on the counter for about 30 minutes, or warm it in the microwave for a few seconds.

These bars are delicious at room temperature, but if you want that just-baked warmth, pop individual squares in the microwave for 10 to 15 seconds. That softens the caramel and makes the top slightly gooey again. For a larger batch, reheat in a 300°F oven for 5 to 8 minutes.

Biscoff Caramel Cookie Bars FAQ

Can I use quick oats instead of old fashioned?

I don’t recommend it. Quick oats absorb more liquid and will make the bars dry and less chewy. Stick with old fashioned rolled oats for the best texture.

Why did my caramel leak out during baking?

The caramel can seep through the bottom crust if it wasn’t pressed firmly enough. Make sure the first layer is compact and baked for a full 12 minutes. Also, spread the caramel in an even layer and avoid getting it too close to the edges.

Can I use salted butter instead of unsalted?

You can, but reduce the added salt to 1/4 teaspoon. The salted butter already has salt, and you’ll also be adding flaky salt on top. Taste the dough before baking if you’re unsure.

How do I get neat, clean cuts without the caramel sticking?

Let the bars cool completely, at least 1 hour. Use a sharp chef’s knife and wipe it clean between cuts. For extra-clean edges, chill the pan in the fridge for 20 minutes before slicing.