The easiest peanut butter and jelly oat bars. These take about 5 minutes to prep and are so addicting! Peanut butter and jelly oat bars are perfect for your spring get-togethers! 

stack of three jelly oat bars on a stack of plates

It’s peanut butter jelly time!

I’m a sucker for a good strawberry jam! Whenever there’s a jar in the refrigerator, I find myself swirling a bit into my vanilla yogurt for a snack. Spread it thick on a peanut butter and jelly sandwich. And too often than not my breakfast is an English muffin, smeared with little creamy salted Irish butter and, you guessed it, more strawberry jam!

So today I’m turning my all-time jelly obsession into oat crumble bars. PB&J oat bars are like a peanut butter and jelly sandwich, but with an oat crust and omgosh, it’s so good! These bars are nutty and sweet, but not overly sweet. They have just the right amount of sugar to make it taste like dessert but doesn’t set my teeth on edge. The older I get, the more I just can’t take super sweet desserts.

Call this a sophisticated pb&j bar if you’d like.

close up of bars showing oat crumble and glistening jelly

Oat crumble bars are totally my jam (pun intended, because how could I not?) I’ve shared an apple crumble version in the fall with you. We diced up apples and layered them between an oat crust and an oat crumble on top. One of the reasons I love these types of oat crumble bars is because the crust also doubles as the topping. It’s all made in one bowl and takes hardly any time at all.

Quick desserts like these jelly oat bars are perfect for impromptu game nights, pot lucks and all sorts of spring get-togethers.

spreading jam with offset spatula on the bottom oat crust

What ingredients do you need to make peanut butter jelly oat bars?

  • all-purpose flour
  • rolled oats
  • shredded sweetened coconut (optional)
  • salted butter
  • sugar
  • creamy peanut butter
  • baking powder
  • ground cinnamon
  • jam

Why use rolled oats:

It’s important to note that this recipe calls for rolled oats (sometimes called, old-fashioned or even whole oats) and not quick cooking oats. Quick cooking oats, unfortunately, aren’t a good substitute because as the name suggests, they cook much faster than old fashioned oats and would require a different ratio of butter, sugar, etc. For best results, I recommend using rolled oats for today’s oat bars.

hand sprinkling top crumble mixture on spread jam

What kind of peanut butter should I use?

Creamy peanut butter is what I prefer here, and I’m not sure if crunchy peanut butter would work as I haven’t tried using it in these oat bars before. My best guess is that it should be fine if you prefer a crunchier texture!

What flavor of jam would work well with the peanut butter?

Pretty much anything you like!

  • raspberry
  • strawberry
  • blackberry
  • grape
  • mixed berry
  • cherry
Basically anything that you’d want to pair with peanut butter should work.
12 pieces of jelly oat bars on crumpled wax paper with scattered crumb topping

I’m allergice to coconut, do I have to use it?

Nope! I prefer to use it here because I love the nuttiness it lends to these oat bars. However, the recipe will work equally well without it!

How to make the crust and crumble for peanut butter jelly oat bars:

Grab a bowl; we’re going to melt the butter and the peanut butter together in a microwave-safe bowl first.

Okay, so I wasn’t kidding when I said these bars are so easy to make! Mix all the dry ingredients except in a bowl and slowly pour in the melted butter mixture while you stir or mix using a fork or spoon. When the mixture resembles a sand-like texture, it’s done. Press two-thirds of the mixture into your baking dish and keep the last one-third for the crumble topping! Spread not the jelly in an even layer and top it with the reserved crumble. That’s it!

wood spatula lifting jelly oat bars from crumpled wax paper

Tips on making the best peanut butter jelly oat bars:

  • Here  is the baking pan I used. It’s a 12×9.5 rectangle pan so the bars are thicker than what they’d be if you used a traditional 13×9. You can make the same thing in a 13×9 pan but keep in mind that the bars will be slightly thinner and you’ll need to decrease the baking time by a couple of minutes.
  • Be sure to pack in the crust. You don’t want the bottom to crumble (quite literally)
  • Use good quality jam here! I’d splurge and use something you love spreading on toast or swirled into your midday yogurt.
  • Let the peanut butter and jelly oat bars cool completely before trying to remove them from the baking pan. At least an hour, longer if you can. Once they’ve cooled for an hour, I usually stick them in the refrigerator and let them cool completely, and it makes it so much easier to slice them that way. If you need them sooner, let them cool on the counter for 15-20 minutes and then stick them in the freezer.

Peanut butter jelly oat bars are salty and sweet and buttery and coconuty and oh so good!

close up to show inside texture and layers of oat crust, jelly and crumble
Yield: 12-24 bars

Peanut Butter and Jelly Oat Bars

Prep Time 5 minutes
Cook Time 45 minutes
Total Time 50 minutes

The easiest peanut butter and jelly oat bars. These take about 5 minutes to prep and are so addicting! Peanut butter and jelly oat bars are perfect for your spring get-togethers! 

Peanut Butter and Jelly Oat Bars


  • 2 ½ cups all-purpose flour
  • 2 cups rolled old-fashioned oats
  • 1 cup salted butter (see notes)
  • ¾ cup EACH: granulated sugar AND creamy peanut butter (the kind that doesn’t require stirring!)
  • ⅓ cup shredded sweetened coconut, optional
  • 1 teaspoon EACH: baking powder AND ground cinnamon
  • 1 (13-ounce) jar of jam (strawberry, grape, raspberry, whatever you like!)


  1. CRUMBLE: Position a rack in the center of the oven and preheat the oven to 350ºF. Line a 13x9 baking sheet with parchment paper; set aside for now. Combine the peanut butter and the salted butter in a microwave-safe bowl and zap in the microwave in 30-second increments until the mixture melts and mixes. Mix the oats, flour, sugar, coconut (optional,) baking powder, and ground cinnamon together in a large bowl. Pour in the melted butter mixture and stir to combine until you form a sand-like crumb. Press two-thirds of the prepared crumb mixture into the prepared pan. You want to make sure the crust is tightly packed in.
  2. SPREAD: Spread the jam over the oat crust layer.
  3. BAKE: Top with the remaining crumb mixture on top. Bake for 40-45 minutes. Remove from the oven and place on a wire rack for one hour. I usually stick mine in the refrigerator for a few hours after that to cool them down completely before cutting into pieces. If you cut them right away, they’ll still be delicious, just not as neat!


  • If you have unsalted butter, just add ½ teaspoon of kosher salt when you add the butter to the recipe.

Have you made this recipe?

If you enjoyed this recipe, please consider leaving a ⭐️⭐️⭐️⭐️⭐️ rating and a comment below. You can also share a picture on Instagram with the hashtag #LITTLESPICEJAR, I'd love to see what you made!

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