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Home Recipes Desserts
5 from 3 reviews

Peanut Butter Millionaire Bars (gluten free)

1 hr 32 min
by: Lindsay Grimes
December 7, 2020 (Updated: November 1, 2022)
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side view of a peanut butter bar leaning against another bar. both bars sit on a white counter and have three layers: a shortbread layer, peanut butter layer, and chocolate layer.
Gluten Free Peanut Butter Millionaire Bars have a buttery layer of shortbread, a sweet peanut butter middle, and a soft chocolate topping.

Holy peanut butter millionaire bars! These are amazing,

Listen, I rarely come across a chocolate peanut butter combo that I don’t immediately love. Chocolate + peanut butter is a match made forever in my heart.

Today, we’re adding some buttery soft shortbread as a base layer and topping it all with my favorite sweet combo.

If you’re familiar with TastyKakes, these peanut butter millionaire bars are like an elevated Peanut Butter Kandy Kake.

side view of a millionaire bar with a bite taken out of it. the bar sits on a white counter with another bar blurred in the background. the millionaire bar has three layers: a shortbread layer, peanut butter layer, and chocolate top layer.

What are millionaire bars?

Some say they’re called millionaire bars because they are so rich and decadent. It’s a flashy, tri-tier cookie bar typically consisting of a shortbread bottom, caramel middle, and chocolate top. Think fancy shamncy Twix bar.

They’re also called caramel squares, caramel shortcake, or caramel squares.

Me? As much as I love caramel, I love peanut butter more. So, I’m making mine Peanut Butter Millionaire Bars with a bottom shortbread layer made from almond flour, a sweet peanut butter middle, and a chocolate topping.

Ingredients and substitutions for Millionaire Bars:

Shortbread ingredients:

  • butter: ghee or refined coconut oil Check out my favorite trick for How to Soften Butter!
  • agave nectar: honey or maple syrup also works as a sub
  • vanilla extract
  • blanched almond flour
  • salt

Ingredients for the peanut butter and chocolate topping:

  • natural peanut butter: I love the peanutbuttery goodness, but any nut or seed butter works here.
  • agave nectar: honey or maple syrup also works
  • refined coconut oil: refined is great because it doesn’t have a strong coconut flavor.
  • chocolate chips
  • heavy cream: you can use coconut cream here if you’re trying to make it dairy free 🙂
  • flakey salt (optional but fun)
overhead image of peanut butter cookie bars with three layers, a shortbread layer, a peanut butter layer and a chocolate layer. the bars alternate, half are standing on their side so you can see their layers, half have the chocolate side up.

How to make Millionaire Bars:

Make the shortbread layer:

Whisk or fold together the melted butter, agave, vanilla, almond flour, and salt. Once combined, transfer the dough to a 9×9 square pan lined with parchment paper.

Use a rubber spatula or your hands to press the shortbread into a flat layer.

Bake for 12 minutes until the edges are golden brown. Remove from the oven and set aside.

Make the peanut butter layer:

All you need to do is whisk, whisk, whisk! Whisk together the natural peanut butter, agave nectar, and melted coconut oil. Once smooth, pour it on top of the baked shortbread layer and chill in the fridge for 30 minutes.

I found it easiest to use a butter knife to spread the peanut butter layer out onto the shortbread. The spatula was a bit too aggressive and messed up some of the top of the shortbread.

Chill this in the fridge for 15 minutes, then make the chocolate topping.

overhead view of four different images depicting four steps to make peanut butter millionaire bars.
overhead view of millionaire bars cut into 28 rectangles.
side view of peanut butter milionaire bars sitting on a white counter. the bars have three layers: a shortbread layer, a peanut butter layer, and a chocolate layer. other millionaire bars are blurred in the background.

Make the chocolate topping:

After the peanut butter layer is done chilling, melt the chocolate in a small bowl (Check out my post How to Melt Chocolate Chips) and whisk in the cream. Once combined, pour it on top of the peanut butter layer and spread it out.

Chill in the fridge for at least an hour for the chocolate to harden. Then, cut into 16 bars.

More peanut butter recipes you’ll love:

  • Oatmeal Peanut Butter Cookie Bars (gluten free + dairy free)
  • Chocolate Chip Peanut Butter Oatmeal Cookies
  • Peanut Butter Swirl Brownies (gluten free)
  • No Bake Chocolate Peanut Butter Oatmeal Bars
  • Peanut Butter Chickpea Blondies
cookie bar with a shortbread layer, peanut butter layer, and chocolate layer leaning against another millionaire bar. both bars sit on a white counter.

Did you make this? Leave a review below and tag me on Instagram, Facebook, or Pinterest!

side view of a peanut butter millionaire bar leaning against another bar. both bars sit on a white counter and have three layers: a shortbread layer, peanut butter layer, and chocolate layer. Recipe

Peanut Butter Millionaire Shortbread Bars (gluten free)

Gluten Free Peanut Butter Millionaire Bars have a buttery layer of shortbread, a sweet peanut butter middle, and a soft chocolate topping.

Recipe by:Lindsay Grimes
5 Stars 4 Stars 3 Stars 2 Stars 1 Star 5 from 3 reviews
Prep: 20 minCook: 12 minTotal: 1 hour 32 min
Print recipe Rate recipe Pin Save recipe
Servings: 20 bars 1x

Ingredients

Shortbread Layer:

  • 2 1/2 cup blanched almond flour (How to Make Almond Flour)
  • 1/2 cup unsalted butter, melted (ghee or refined coconut oil also works)
  • 1/4 cup agave nectar (honey or maple syrup also works)
  • 1 teaspoon vanilla extract
  • 1/4 teaspoon salt

Peanut Butter Layer:

  • 1 1/2 cup natural peanut butter
  • 1/2 cup agave nectar (honey or maple syrup also works)
  • 1/4 cup refined coconut oil, melted

Chocolate Layer:

  • 1 cup semi-sweet chocolate chips
  • 1/4 cup heavy cream (coconut cream also works)

Instructions

Make the shortbread layer:

  1. Preheat the oven to 350F.
  2. Whisk or fold together the melted butter, agave, vanilla, almond flour, and salt.
  3. Once combined, transfer the dough to a 9×9 square pan lined with parchment paper.
  4. Use a rubber spatula or your hands to press the shortbread into a flat layer.
  5. Bake for 12 minutes until the edges are golden brown.
  6. Remove from the oven and set aside.

Make the peanut butter layer:

  1. Whisk together the natural peanut butter, agave nectar, and melted coconut oil.
  2. Once smooth, pour it on top of the baked shortbread layer and chill in the fridge for 30 minutes.
  3. I found it easiest to use a butter knife to spread the peanut butter layer out onto the shortbread. The rubber spatula was a bit too aggressive and messed up some of the top of the shortbread.
  4. Chill this in the fridge for 15 minutes, then make the chocolate topping.

Make the chocolate topping:

  1. After the peanut butter layer is done chilling, melt the chocolate in a small bowl and whisk in the cream.
  2. Once combined, pour it on top of the peanut butter layer and spread it out.
  3. Chill in the fridge for at least an hour for the chocolate to harden.
  4. Then, lift the bars out from the pan by pulling the edges of the parchment paper.
  5. Cut into 16 – 20 bars.

Nutrition Info:

  • Serving Size: 1 bar
  • Calories: 314
  • Sugar: 16.6g
  • Sodium: 69mg
  • Fat: 22.4g
  • Saturated Fat: 9.8g
  • Unsaturated Fat: 0g
  • Trans Fat: 0g
  • Carbohydrates: 22g
  • Fiber: 2.2g
  • Protein: 7.6g
  • Cholesterol: 14mg
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  1. AvatarErika says

    Posted on 7/12/22 at 4:53 pm

    I’m on an anti Candida diet so I would switch peanut butter to almond but as far as the sweetener, I typically use powdered xylitol. Will that work if I just sub it or should I make it into a simple syrup?

    Reply
  2. AvatarErika says

    Posted on 7/26/22 at 10:42 am

    I didn’t get a response to my question but I went ahead and just switched out the agave with powdered xylitol.

    These were AMAZING!! The only thing I would do differently is maybe half the ingredients to the shortbread because I only had an 8×8 pan, the shortbread was too thick in my personal opinion. Otherwise, these were BOMB. Thank you! Making it again soon.

    Reply
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Lindsay

Nice to Meet You!

I’m Lindsay - cookbook author, blogger and chocolate lover! If gluten-free desserts are your jam, you’re in the right place! I live in south Jersey with my family and new puppy Roxie! Some of my favorite things are oat milk lattes, sunny days and warm, gooey chocolate chip cookies.

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overhead image of peanut butter millionaire bars with three layers, a shortbread layer, a peanut butter layer and a chocolate layer. the bars alternate, half are standing on their side so you can see their layers, half have the chocolate side up. text overlay reads "gluten free peanut butter millionaire bars"
side view of a millionaire bar with three layers: shortbread, peanut butter, and chocolate. the bar leans against a second bar. both are on a white counter. text overlay reads "gluten free peanut butter millionaire bars."