Pecan Pie Protein Bars (Sugar-Free, Gluten-Free, Keto)

These pecan pie protein bars have a no-bake pie crust-like base and a sticky, ooey gooey pecan caramel topping, just like the real thing. They're a sugar-free, gluten-free, and keto-friendly protein snack that's great for fall.

This is part of my protein bar series, along with my pistachio protein bars and chocolate protein bars.

Pecan pie protein bars lined up on a bamboo cutting board beside a small green bowl of whole pecans on marble.

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I wanted to make a topping that actually tasted like pecan pie filling. That sticky, caramel-like kind with lots of pecans. This bar has a similar base as the rest of my protein bar series, but the bottom is a little thinner, more like a pie crust. Browning the butter for the topping gives it that deep caramel color and flavor.

These are great for fall snacking with no oven required. Give the bars the full hour to chill in the fridge, so the pecan topping has time to firm up completely before you slice them. I hope you love these as much as I did making them for you!

Ingredients

Here's what you'll need to make this:

Topping ingredients for pecan pie protein bars: a stick of butter, granulated sweetener, chopped pecans, and heavy cream.

Full ingredient amounts, instructions, and notes are in recipe card at the bottom of this post. (or use the 'jump to recipe' button at the top of this post).

Here's a few notes about key ingredients:

Protein powder (vanilla or caramel): I used Keto Chow's caramel flavor, which is a milk protein isolate based powder with xanthan gum, acacia fiber, and caramel flavor added for better texture and flavor. For a swap, milk protein isolate, milk protein concentrate or 80% casein/20% whey blends should work, but the texture will change slightly. Vanilla works too.
Almond or pecan butter, warmed: Pecan butter gives it more pecan flavor, but almond butter works just as well. Warm it slightly so it stirs in smoothly.
Liquid allulose: I used a honey-style liquid allulose in the base for the best chewy texture.
Granulated allulose: Allulose keeps this caramel topping chewy and sticky instead of turning hard and crystallized once it cools.

How To Make

This recipe is super easy to make, and here's how to make it:

Before you get started: Warm the almond or pecan butter slightly so it's easy to stir in. Line a 9x5 inch loaf pan with parchment paper, and let it hang over the sides for easy lifting later. Measure out the heavy cream ahead of time, since the caramel moves fast once it starts bubbling.

Almond butter, melted butter, protein powder, and almond flour in a glass bowl with a spatula, ready to stir together.

Crumbly protein bar dough in a glass bowl after mixing the nut butter, melted butter, and sweetener into the dry base.

Mix the dry ingredients first. Stir the protein powder and almond flour together before adding anything wet. This keeps the powder from clumping once the nut butter goes in.

Crumbly pecan pie protein bar base mixture added to a parchment-lined loaf pan held in place with metal clips.

A spoon pressing the protein bar base into an even layer in a parchment-lined loaf pan, with pecans in a bowl nearby.

Press the base firmly and evenly. It should look like a compact layer like a pie crust. A firm base keeps the bars from falling apart when you slice them.

Butter melting beside a mound of granulated sugar-free sweetener in a white saucepan on a marble counter.

Butter and sugar-free sweetener bubbling in a white saucepan as the mixture turns lightly golden for the pecan topping.

Brown the butter fully before adding the allulose. Let it bubble and turn a light golden color, about 2 minutes over medium-low heat. This is what gives the caramel its deep color and nutty, pie-like flavor.

Heavy cream swirled into the golden butter and sweetener mixture in a white saucepan to make a glossy caramel sauce.

Chopped pecans added on top of the sugar-free caramel sauce in a white saucepan before stirring to coat.

Watch the caramel closely once you whisk in the cream. It will bubble and thicken within about a minute. Allulose can burn quickly. Pull the pan off the heat as soon as the caramel turns glossy.

A spatula stirring chopped pecans through the sugar-free caramel sauce in a white saucepan until evenly coated.

Sticky caramel pecan topping being poured from a saucepan onto the pressed protein bar base in a lined loaf pan.

A spatula spreading the caramel pecan topping over the base of the pecan pie protein bars in a parchment-lined pan.

Let the topping cool for a couple of minutes before adding the pecans. This keeps the caramel from cooking the nuts or thinning out too much. Stir until every pecan is coated.
Give the bars the full hour to chill. The topping needs that time to firm up completely. If you slice too early, the caramel will ooze instead of hold its shape.

A stack of pecan pie protein bars on a white plate showing the glossy pecan topping and soft crust-like base.

Olivia's Top Tips

Brown the butter, don't just melt it. Letting it bubble and turn light golden is what makes the topping taste like real pecan pie caramel.
Use granulated allulose in the topping. It's what keeps the caramel chewy and sticky instead of turning hard once it cools.
Chill for the full hour. The pecan topping needs that time to firm up enough to slice cleanly without oozing.
Swap in pecan butter for extra pecan flavor. Warm it first so it stirs in as easily as almond butter.

Frequently Asked Questions

Why is my caramel topping too thin or runny?

This usually means the butter and allulose didn't cook long enough before you added the cream. Let the mixture bubble and turn golden first, then cook it about another minute after whisking in the cream so it can thicken and turn glossy.

Can I use a different sweetener than allulose?

I tested this recipe with allulose because it keeps the caramel chewy instead of turning hard once it's chilled. I haven't tested other sweeteners in this recipe, so the texture may turn out differently.

Check out the printable recipe card below for all the measurements, instructions, and my notes.

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