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Updated: Jul 21, 2025 · Published: Jan 6, 2025 by Nikki · This post may contain affiliate links · Leave a Comment

HEALTHY LEMON PROTEIN BARS

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Who says protein bars have to be boring? These Healthy Lemon Protein Bars are zesty, nut-free, and packed with all the goodness you need to fuel your day. Made in 20 minutes and can easily be made vegan!

PS. I think you will love making my oat flour cookies next.

A tray of Protein Lemon Bars with drizzled chocolate and slices of lemon on the side.

Cheaper than store-bought 👆🏼

🍋 NUT FREE HIGH PROTEIN LEMON BARS

I love a quick and easy homemade snack. Like my goo balls or bliss balls, these high-protein lemon bars are easy to make and won't break the bank.

I make these nut-free protein bars for busy weeks, road trips, post-workout refuels, mid-day pick-me-ups, or snack emergencies!

A stack of protein lemon bars.

✏️ HEALTHY SNACK

These nut-free protein bars are an ideal snack for school or work lunch boxes!

With no nuts to worry about, they’re safe for nut-free zones while still packing a punch of flavor and protein.

Their compact size and sturdy texture make them easy to transport without falling apart.

I drizzle a lemon icing glaze over the top and some melted chocolate or Nutella (or honey) for extra sweetness.

Talking about lemon, if you love lemon glaze, you will LOVE my lemon and lavender cookies!

A slice of a protein lemon bar.

❤️ WHY YOU WILL LOVE THESE BARS

Nut-Free Goodness: Perfect for anyone avoiding nuts.

High Protein, Low Sugar: Thanks to the unflavored whey protein powder and minimal sweeteners.

Lemon Bliss: The combination of fresh lemon juice, zest, and a tangy glaze is a flavor explosion.

A stack of protein bars with lemon and a lemon glaze. Chocolate is drizzled over the top.

SNACK RECIPES TO TRY NEXT TIME

A lemon ball bitten in half.
LEMON BALLS
healthy bliss balls piled into a small bowl.
BLISS BALLS

🥄 INGREDIENTS NEEDED AND SUBSTITUTIONS

Old-Fashioned Rolled Oats: The base of these bars, providing a hearty texture and fiber. Substitute with quick oats for a softer texture, or quinoa flakes for a gluten-free alternative.

Oat Flour: Adds structure and binds the ingredients. Make your own by blending rolled oats or use almond flour for a nutty twist (if nuts are an option).

Protein Powder: Boosts the protein content and helps create a chewy texture. Unflavored whey or vanilla whey works best, but vegan protein powder is a great dairy-free substitute.

Salt: Enhances the flavors and balances the sweetness. Sea salt or kosher salt can be used interchangeably.

Coconut Oil or Unsalted Butter: Provides moisture and richness. Swap with olive oil or vegan butter for dietary preferences.

Maple Syrup or Honey: Natural sweeteners that bind and add flavor. Agave syrup or brown rice syrup can be used as an alternative.

Brown Sugar or Coconut Sugar: Adds depth of sweetness. Use granulated white sugar or monk fruit sweetener for a lower-calorie option.

Lemon Juice: The zesty, tangy star of the recipe. Lime juice works as a substitute, though it will slightly alter the flavor.

Lemon Zest: Intensifies the citrusy goodness. Lime zest can replace it for a slightly different but still delicious result.

FOR THE GLAZE

Powdered Sugar: Creates the luscious glaze. Substitute with a sugar-free powdered sweetener for a lower-sugar option.

Fresh Lemon Juice: Key for a tangy glaze. Again, lime juice can be used if needed.

Lemon Zest: Adds bursts of citrus flavor to the topping. Lime zest works here too

Ingredient list for protein lemon bars.

🌈 ADD-IN IDEAS

poppy seeds

coconut flakes

3 tablespoons white chocolate chips

Melted chocolate or Nutella

👩🏼‍🍳 STEP-BY-STEP INSTRUCTIONS


Note: Please scroll to the full printable recipe card at the bottom for ingredient quantities and the method.

1. Prep Your Pan:
Preheat your oven to 350°F (175°C). Line a loaf pan with parchment paper, leaving some overhang for easy removal.

2. Mix the Dough:
In a large mixing bowl, combine rolled oats, oat flour, protein powder, and salt.

Mix the dry ingredients.
MIX THE DRY INGREDIENTS.
Melt the butter/coconut oil.
MELT THE BUTTER/COCONUT OIL.

In a separate bowl, whisk together melted coconut oil (or butter), maple syrup (or honey), brown sugar, lemon juice, and zest. Pour the wet ingredients into the dry and stir until the dough resembles cookie dough.

Add the lemon juice.
ADD THE LEMON JUICE.
Add the lemon zest.
ADD THE LEMON ZEST.

3. Bake:
Press the dough evenly into the prepared pan. Bake for 10–12 minutes or until the edges are puffed up and slightly golden. The bars will harden as they cool. Let it cool completely in the pan before adding the glaze.

Add the wet ingredients to the dry.
ADD THE WET INGREDIENTS TO THE DRY.
The final mixture.
THE FINAL MIXTURE.

Mix It Up:
In a small bowl, whisk powdered sugar, lemon juice, and zest until smooth.

2. Glaze & Love:
Drizzle the glaze generously over the cooled bars. Want even more lemony goodness? Double the glaze recipe. Let the glaze set for about 15 minutes before slicing the bars.

Optional: add Nutella or melted chocolate.

Bake.
BAKE.
Make the lemon glaze.
MAKE THE LEMON GLAZE.


💫 If you loved this recipe, leave a 5-star review and rating!

📝 TIPS AND TRICKS

DIY Oat Flour: If you don’t have oat flour, just blitz rolled oats in a blender until fine.

Make It Sweeter: Prefer sweeter bars? Add an extra tablespoon of brown sugar or coconut sugar.

Custom Glaze: You can tweak the glaze thickness by adjusting the powdered sugar-to-lemon juice ratio.

Double the Glaze: If you’re a fan of extra sweetness and tangy flavor, double the glaze recipe. It’s the perfect way to make these bars even more indulgent!

Let the Bars Cool: Completely before adding the glaze to avoid it melting into the bars.

Customize Your Protein: Use unflavored whey protein for the cleanest taste, but feel free to experiment with vanilla or lemon-flavored protein powders for an extra flavor boost!

Lemon protein bars with a drizzle of chocolate on the top.

❓ FAQS

CAN I MAKE THESE INTO MIINI BARS?

Absolutely! Turning these into mini bars is a fantastic idea, especially for portion control or bite-sized snacking. Use a sharp knife to slice them into mini bars or squares. You can aim for bite-sized pieces or whatever size suits your snack needs.

ARE THESE GLUTEN-FREE?

Yes, these can be made gluten-free if you ensure that oats, oat flour, and protein powder are certified gluten-free.

MAKE-AHEAD AND STORAGE

One of the best things about these Lemon Protein Bars is how easy they are to store. Here's how to keep them fresh and delicious:

MAKE-AHEAD:

These lemon Protein Bars are perfect for prepping in advance! Whip up a batch on the weekend, and you’ll have a ready-to-go snack for the entire week (or longer if you freeze them). The bars hold their flavor and texture well, making them ideal for busy schedules.

STORAGE:

  • Countertop: Store them in an airtight container for up to 2 days.
  • Refrigerator: Keep them in the fridge for up to 6 days. They’ll stay firm and flavorful.
  • Freezer: Want to stock up? These bars freeze beautifully! Wrap them individually or place parchment paper between layers in an airtight container. Freeze for up to 2 months. Just thaw in the fridge or at room temperature when ready to enjoy.

A stack of protein bars with lemon and a lemon glaze. Chocolate is drizzled over the top.


Did you make this recipe? Let me know what you think by leaving a ★★★★★ star rating & comment below. It genuinely helps me & I really appreciate your support! Nikki 💚

Print
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A tray of Protein Lemon Bars with drizzled chocolate and slices of lemon on the side.

HEALTHY LEMON PROTEIN BARS


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  • Author: NIKKI
  • Total Time: 10 min Prep Time + 10 min Bake Time = 20 min Total Time
  • Yield: 6 servings 1x
  • Diet: Vegan
Print Recipe

Description

Who says protein bars have to be boring? These Healthy Lemon Protein Bars are zesty, nut-free, and packed with all the goodness you need to fuel your day. Made in 20 minutes and can easily be made vegan!


Ingredients

Scale

1 ½ cups old-fashioned rolled oats (gluten-free certified, if needed)

¼ cup oat flour, spooned and leveled (homemade or store-bought)

⅓ cup vanilla protein powder

½ teaspoon salt

¼ cup melted coconut oil or unsalted butter

¼ cup maple syrup or honey

1 tablespoon brown sugar, white sugar, or coconut sugar

1 teaspoon lemon juice

1 tablespoon lemon zest

FOR THE GLAZE

¼ cup powdered sugar

1 ½ tablespoon fresh lemon juice

1 tablespoon lemon zest

Nutella or melted chocolate (optional)


Instructions

1. Prep Your Pan:
Preheat your oven to 350°F (175°C). Line a loaf pan with parchment paper, leaving some overhang for easy removal.

2. Mix the Dough:
In a large mixing bowl, combine rolled oats, oat flour, protein powder, and salt.

In a separate bowl, whisk together melted coconut oil (or butter), maple syrup (or honey), brown sugar, lemon juice, and zest. Pour the wet ingredients into the dry and stir until the dough resembles cookie dough.

3. Bake:
Press the dough evenly into the prepared pan. Bake for 10–12 minutes or until the edges are puffed up and slightly golden. The bars will harden as they cool. Let it cool completely in the pan before adding the glaze.

Mix It Up:
In a small bowl, whisk powdered sugar, lemon juice, and zest until smooth.

2. Glaze & Love:
Drizzle the glaze generously over the cooled bars. Want even more lemony goodness? Double the glaze recipe. Let the glaze set for about 15 minutes before slicing the bars.

Optional: Drizzle Nutella or melted chocolate on top of the glaze. 

💫 If you loved this recipe, leave a 5-star review and rating!

 

Notes

DIY Oat Flour: If you don’t have oat flour, just blitz rolled oats in a blender until fine.

Make It Sweeter: Prefer sweeter bars? Add an extra tablespoon of brown sugar or coconut sugar.

Custom Glaze: You can tweak the glaze thickness by adjusting the powdered sugar-to-lemon juice ratio.

Double the Glaze: If you’re a fan of extra sweetness and tangy flavor, double the glaze recipe. It’s the perfect way to make these bars even more indulgent!

Let the Bars Cool: Completely before adding the glaze to avoid it melting into the bars.

Customize Your Protein: Use unflavored whey protein for the cleanest taste, but feel free to experiment with vanilla or lemon-flavored protein powders for an extra flavor boost!

  • Category: Baking, Desserts, Snacks
  • Method: Baking
  • Cuisine: American

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