This post may contain affiliate links. For more information, read my disclosure policy.

If you love Millionaire Bars (or Billionaire Bars) then you’ll be head over heels for these Peanut Butter Caramel Shortbread Bars!

stack of cookie bars with shortbread layer, peanut butter caramel layer, chocolate layer and reese's pieces on top

In more “Dorothy has weird pets” news…

Have I ever told you that Ginger likes to walk herself? Whenever I walk her she reaches back and grabs the leash in her teeth.

Sometimes she turns around with it in her mouth and takes me back home. I’m serious! She’ll get a block from home and decide she’s not into it, grab the leash and pull me as hard as she can back to the house.

Sometimes she likes to just hold it her mouth while I hold the end and walk that way. She “walks herself”.

And then, there are days like Friday. She grabbed the leash in her mouth and stopped me from walking. I asked her where she wanted to go. She promptly walked me across the street to the big shady yard with the beautiful cypress tree and, before I could stop her, did…you know. Then she dropped the leash and we went on our merry way.

I swear, sometimes I think she’s a reincarnated person. Someone passed away and hit the return button, and instead in landing in themselves, they landed in my dog.

When I die, I want to be reincarnated into peanut butter. Or someone who tests peanut butter. Maybe someone who works at Skippy?

stack of cookie bars with shortbread layer, peanut butter caramel layer, chocolate layer and reese's pieces on top

I’ve been wanting to make millionaire bars forever. They’re also called billionaire bars. Or Twix bars. Whatever, I’ve been wanting to make them forever.

But, well, I’m me. I can’t just make the same bar – I have to put my spin on it. It’s what you love about me, right? That and my amazing personality? (Kidding.)

So of course my mind went to peanut butter. I’m addicted!

Did you know that peanut butter and caramel is amazing?

Did you know you can make a soft caramel with peanut butter?

Yup. You can!

Stack of three Peanut Butter Caramel Shortbread Bars on white parchment paper

There is a basic shortbread base on these bars. It’s baked and cooled. Then you add the fun parts: the caramel and the chocolate.

The caramel layer is made of unwrapped caramel squares (I used Kraft) melted with peanut butter and heavy cream. You spread that on top the buttery shortbread.

Then you melt chocolate chips with peanut butter and spread that on top the caramel. I added Reese’s Pieces to the top because, well. Everything is better with Reese’s!

Once the bars are completely chilled and the chocolate is hard, you’re good to go. I cut these bars when they were really cold, but I don’t recommend eating them until they come up closer to room temperature. The caramel gets really hard in the fridge, so let it warm up a bit so you don’t hurt your teeth.

The peanut butter flavor comes through in both the caramel and the chocolate. You’re not hit over the head with peanut butter but it’s there and it’s good. It’s an accent in these, which is fine by me. Anytime I can accent anything with peanut butter, I’m a happy girl.

These bars aren’t weird. My dog might be, but not these. Shortbread + Caramel + Chocolate + Peanut Butter = Wonderful!

stack of cookie bars with shortbread layer, peanut butter caramel layer, chocolate layer and reese's pieces on top

Peanut Butter Caramel Shortbread Bars {millionaire bars}

No ratings yet
Yield 16 bars


For the shortbread

  • 1 stick 1/2 cup butter, softened
  • 1/2 cup granulated sugar
  • 1 teaspoon vanilla extract
  • 1 cup flour

For the caramel

  • 25 caramels unwrapped (I used Kraft)
  • 2 tablespoons peanut butter
  • 1 tablespoons heavy cream

For the chocolate

  • 1 1/4 cups chocolate chips milk or semi-sweet
  • 2 tablespoons peanut butter
  • 1/2 cup mini Reese’s Pieces optional


  • Preheat oven to 350F. Line an 8x8 pan with foil and spray with cooking spray.
  • Make the shortbread by creaming the butter and sugar with a hand or stand mixer until fluffy. Mix in vanilla and then stir in flour. Press into the bottom of the prepared pan. Bake for 16-18 minutes until slightly golden brown on top. Cool about 20 minutes before continuing.
  • Make the caramel layer by adding caramels, peanut butter, and heavy cream in a microwave safe bowl. (Before heating, have an offset spatula or an extra metal spoon and more cooking spray handy for spreading.) Heat for 40 seconds on HIGH, stir, then melt for an additional 10-20 seconds. Stir until smooth. Pour on top of shortbread. Use an offset spatula or metal spoon coated with cooking spray to evenly spread in the pan. Chill 10 minutes before adding chocolate.
  • Make the chocolate topping by melting chocolate chips and peanut butter together in the microwave, about 30-45 seconds. Stir until smooth and pour over caramel. Spread carefully. Top with Reese’s Pieces, if desired. Chill until completely firm, several hours.
  • Before slicing, let the bars warm up a little. The caramel gets hard, and it will be hard to cut until they start to come to room temperature. Best eaten at room temp, so the caramel doesn’t hurt your teeth!
Nutritional information not guaranteed to be accurate

Click here to see more PEANUT BUTTER recipes!

Caramel Banana Pecan Doughnuts

Peanut Butter Oatmeal Cookie Dough Truffles

Sweets from friends:
Peanut Butter Caramel Twix Bars by Averie Cooks
Chocolate Chip Cookie Dough Bars by The Recipe Critic
Fudgy Brownies with a Cruncy Butterfinger Crust by Life Love and Sugar
Monster Cookie Brookies by Something Swanky

Last Updated on May 30, 2020

Dorothy Kern

Welcome to Crazy for Crust, where I share recipes that are sometimes crazy, often with a crust, and always served with a slice of life.

Learn to Bake in 4 Days!
Get my tips, tricks and recipes to take your baking to the next level for FREE!

Leave a Comment

Your email address will not be published. Required fields are marked *

Recipe Rating


  1. I love your dog Dorothy! I love peanut butter and caramel too, I don’t think people realize how amazing that combination really is. These looks fantastic!

  2. These look delicious! I love the peanut butter in the caramel – what a great idea! And I totally understand your feeling about Ginger. Sometimes I’d swear our dog Jessie knows so much more than we give her credit for. I love it! 🙂

  3. I love the idea of peanut butter flavored caramel, and millionaire bars are one of my favorite desserts. Pinning these!

  4. I love you just the way you are! Your sweet personality and crazy baking skills!!! Keep the peanut butter goodness coming…you’ll never hear me complain! These bars are absolutely fabulous!!!!

  5. Lol dogs have such funny personalities. My little Abby will bite the leash too but it’s because she hates submitting to my authority. My husband is the alpha and she listens to him unconditionally. Me? She thinks I’m her toy. Sigh. Oh well, I love her to pieces. Just like I looooooooove these gorgeous millionaire bars and your peanut butter spin on them. How in the heck did you get the layers so perfectly? I’ve made this once and mine looked no where near as beautiful as yours. This just means I need to make this recipe again and again until I reach that standard 😉