a stack of millionaire shortbread

SunButter Millionaire Shortbread Bars (Gluten Free)

  • Author: Jenna Barnard
  • Prep Time: 1 hour 30 minutes
  • Cook Time: 15 minutes
  • Total Time: 1 hour 45 minutes
  • Yield: 16 bars 1x


Millionaire shortbread bars layered with gluten free shortbread, SunButter caramel, and salted dark chocolate! They’re buttery, soft, and so easy to make.



Gluten Free Shortbread

  • 1/2 cup unsalted butter, room temp
  • 1/4 cup powdered sugar
  • 2 tbsp packed light brown sugar
  • 1/4 tsp salt
  • 1 1/4 cup gluten free all-purpose flour (with xanthan gum)
  • 1 tbsp water

SunButter Caramel

  • 6 tbsp unsalted butter
  • 1/4 cup maple syrup
  • 1/2 cup creamy SunButter
  • 1/2 tsp vanilla extract


  • 1/4 cup unsalted butter
  • 3/4 cup dark chocolate chips
  • Flaky sea salt


  1. Preheat the oven to 350F and grease and line an 8×8 baking pan with parchment paper.
  2. Using an electric mixer, cream together the butter and sugars on medium speed until you reach a paste-like consistency.
  3. Mix in the salt and flour until combined. At this point the dough will look loose and crumbly. Add a tablespoon of water to bring it back together. If still crumbly, add another tablespoon. 
  4. Press the dough into the bottom of your pan and bake for 15-18 minutes.
  5. Let it sit out to cool while you make the caramel.
  6. In a saucepan, add the butter, maple syrup, and SunButter. Over medium heat, melt down the ingredients and stir to combine. Continue stirring just until it starts to bubble.
  7. Remove from heat and stir in the vanilla.
  8. Pour it over the cooled shortbread and spread it even if needed. Place the pan in the fridge for the caramel to set. About 30 minutes to an hour.
  9. Once set, melt the chocolate. Place a heat-safe bowl over a pot filled with about an inch or two of water. Add the chocolate and butter to the bowl and bring the water to a simmer (never a boil). 
  10. Stir until fully melted. Pour over the caramel and spread even. Place the pan back in the fridge for an additional 30 minutes to set. 
  11. Sprinkle some flaky sea salt on top before serving. Enjoy!

Keywords: millionaire shortbread, millionaire bars, gluten free shortbread, gluten free millionaire shortbread

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