Peanut Butter Sugar Cookie Bars are my go-to when I want a soft and chewy cookie situation without scooping dough. They bake up thick in a pan, slice cleanly, and have that familiar sweet peanut butter flavor that just works.
The texture is the whole point for me: tender in the middle with slightly firmer edges, like the best part of a peanut butter cookie but easier to serve. A little sprinkle of granulated sugar on top gives them that classic sugar-cookie finish.
I make these for bake sales, cookie trays, and weekends when I want something simple that holds up well on the counter. They’re also great with a glass of milk or coffee, especially if you add a pinch of flaky salt on top.
Why You’ll Love This Recipe
Simple to serve: You bake one pan, cool, and slice. No rolling, no fork marks, no batches of cookie sheets.
Soft and chewy: These stay tender in the middle with just a little crispness at the edges, which is exactly what I want from a cookie bar.
Big peanut butter flavor: Creamy peanut butter makes the bars taste like a classic PB cookie, but with a thicker, softer bite.
Easy to customize: Chocolate chips, peanut butter chips, chopped peanuts, or a little flaky salt all work here without changing the base recipe.
Great for cookie trays: They slice neatly and stack well, so they’re easy to share and transport.
Ingredients You’ll Need
Cookie Bar Dough
- Unsalted butter: I like it softened so it creams easily with the sugars. If it’s still cold, you’ll end up chasing little butter lumps around the bowl.
- Creamy peanut butter: Regular creamy peanut butter (the classic jar kind) gives the most consistent texture. Natural peanut butter works too, but stir it really well first.
- Granulated sugar: This gives that classic sugar-cookie sweetness, and I also like a little extra sprinkled on top for a bit of crunch.
- Light brown sugar: Brown sugar is what keeps the bars chewy and a little softer the next day. Dark brown sugar is fine if that’s what you have.
- Eggs: Room temperature eggs mix in more smoothly. If yours are cold, just let them sit in warm water for a few minutes.
- Vanilla extract: Don’t skip it. It makes the dough taste more like a cookie and less like plain sweet peanut butter.
- All-purpose flour: I use regular flour here. Spoon and level if you can—too much flour makes the bars a little dry.
- Baking powder: Helps the bars lift and set up so they slice nicely.
- Baking soda: This helps with spread and browning, especially around the edges.
- Fine salt: Peanut butter needs salt to taste right. If you only have salted butter, I’d still add a little salt, just slightly less.
Optional Toppings
- Granulated sugar: A light sprinkle on top gives a simple, classic finish and a tiny bit of crunch.
- Chocolate chips: Semisweet is my usual, but milk chocolate is fine if you want them sweeter. You can also swap in peanut butter chips.
- Flaky salt: Totally optional, but a small pinch on top is nice if you like that sweet-salty thing.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Line a 9×13-inch pan with parchment paper and lightly grease it.
- Mix the dry ingredients: In a medium bowl, whisk the flour, baking powder, baking soda, and salt until evenly combined.
- Cream the butter and peanut butter: In a large bowl, beat the butter, peanut butter, granulated sugar, and brown sugar until light and creamy.
- Add the eggs and vanilla: Mix in the eggs, then add the vanilla and beat until smooth.
- Add the dry ingredients: Add the dry mixture to the bowl and mix just until you don’t see dry flour.
- Spread the dough: Press and spread the dough evenly into the prepared pan, then smooth the top.
- Add toppings: Sprinkle the top with granulated sugar and add chocolate chips if you’re using them. Add a little flaky salt too, if you like.
- Bake: Bake for 20 to 25 minutes, until the edges are set and lightly golden and the center is just set.
- Cool and slice: Cool completely in the pan, then lift out using the parchment paper and slice into bars.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Don’t overbake them. Pull the pan when the edges look set and the center still looks slightly underbaked. The bars keep setting as they cool, and that’s how you get the soft middle.
Use parchment paper. It makes it much easier to lift the whole slab out for clean slicing. It also helps if you go a little heavier on chocolate chips and the top gets bumpy.
Stir natural peanut butter well. If the jar is separated, you’ll get oily pockets in the dough. Once it’s fully mixed, it works fine and makes a slightly more tender crumb.
Mix just until combined. As soon as the flour disappears, stop mixing. Overmixing can make the bars a little tougher and more bready than cookie-like.
Let them cool completely before slicing. Warm bars are harder to cut neatly and can look a little underdone even when they’re fine. Cooling makes the texture settle in.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Milk: A cold glass of milk is classic with these, especially if you add a little flaky salt on top. I like this best when the bars are at room temperature.
- Coffee or espresso: These are really good with coffee, since peanut butter and brown sugar can be pretty rich. A plain latte or black coffee is great.
- Ice cream: If you want dessert-dessert, serve a bar with a scoop of vanilla ice cream. A drizzle of chocolate sauce is nice if you used chocolate chips.
- Fruit: Strawberries, raspberries, or sliced bananas are simple on the side and make the plate feel a little less heavy. I usually do this when I’m serving them after dinner.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store the bars airtight at room temperature and they’ll stay soft and chewy for a few days. I like to keep parchment between layers if I stack them.
If you want to make this recipe ahead, you can bake the pan the day before and slice the next day. The flavor actually gets a little better after it sits overnight.
If you want them longer-term, you can freeze individual portions or freeze a whole slab wrapped well. Let them thaw at room temperature, or thaw in the fridge overnight.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
How do I know when peanut butter cookie bars are done?
I look for set, lightly golden edges and a center that’s just set but still looks a little soft. If you wait until the middle looks totally firm in the oven, they usually cool up drier.
Can I use natural peanut butter?
Yes. Stir it really well first (all the oil mixed back in), and expect the bars to be a little more tender and a bit more delicate when warm.
Can I add mix-ins?
Definitely. Up to about 1/2 cup of chopped peanuts works well, or swap the chocolate chips for peanut butter chips. I’d avoid going too heavy on add-ins or the bars can get crumbly when you slice them.
Do I have to add the sugar on top?
No, but I like it. It gives a simple sugar-cookie finish and a little crunch on the surface, especially if you’re skipping chocolate chips.
Can I double this recipe?
You can, but I’d bake it in two 9×13 pans instead of a deeper pan. A thicker slab takes much longer to bake through and it’s harder to keep the center soft without overbaking the edges.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Peanut Butter Sugar Cookie Bars
INGREDIENTS
Cookie Bar Dough
- ¾ cup unsalted butter softened
- ¾ cup creamy peanut butter
- 1 cup granulated sugar
- ½ cup light brown sugar packed
- 2 large eggs room temperature
- 2 tsp vanilla extract
- 2.25 cups all purpose flour
- 1 tsp baking powder
- ½ tsp baking soda
- ½ tsp fine salt.
Optional Toppings
- 2 tbsp granulated sugar for sprinkling
- ½ cup chocolate chips
- flaky salt to taste.
INSTRUCTIONS
Prep
- heat oven to 350 F
- line a 9x13 inch pan with parchment and lightly grease
- whisk flour baking powder baking soda and salt in a bowl.
Mix And Bake
- cream butter peanut butter granulated sugar and brown sugar until light
- mix in eggs and vanilla until smooth
- add dry ingredients and mix just until combined
- spread dough evenly in pan and smooth the top
- sprinkle with granulated sugar and add optional chocolate chips
- bake until edges are set and lightly golden and center is just set 20 to 25 minutes
- cool completely in pan then lift out and slice into bars.
