Keto Peanut Butter Banana Muffins – Easy, Fluffy, and Satisfying

Peanut butter and banana is a classic combo, but traditional banana muffins pack a lot of sugar and carbs. These keto peanut butter banana muffins give you the same cozy flavor without the crash. They’re soft, moist, and full of nutty richness, with the perfect hint of banana.

They mix up in one bowl, bake in under 20 minutes, and freeze like a dream. Breakfast, snack, or dessert—these muffins fit anywhere in your day.

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Keto Peanut Butter Banana Muffins - Easy, Fluffy, and Satisfying

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Prep Time 10 minutes mins

Cook Time 20 minutes mins

Total Time 30 minutes mins

Servings 12 servings

Ingredients

  

• 3 large eggs, room temperature
• 1/2 cup creamy natural peanut butter (no sugar added), well-stirred
• 1/3 cup granular or powdered erythritol/monk fruit blend (or to taste)
• 1/4 cup unsweetened almond milk (or unsweetened coconut milk)
• 1/4 cup avocado oil or melted butter, cooled
• 1/3 of a medium ripe banana, well-mashed (about 35–40 g)
• 1 teaspoon banana extract (plus more to taste)
• 1 teaspoon vanilla extract
• 1 1/2 cups fine almond flour
• 2 tablespoons coconut flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon fine sea salt
• Optional mix-ins: 1/4 cup sugar-free chocolate chips, chopped peanuts, or a sprinkle of cinnamon

Instructions

 

• Prep the pan: Heat the oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or grease well.
• Whisk the wet base: In a large bowl, whisk eggs until smooth. Add peanut butter, sweetener, almond milk, oil, mashed banana, banana extract, and vanilla. Whisk until creamy and fully combined.
• Combine the dry ingredients: In the same bowl, add almond flour, coconut flour, baking powder, baking soda, and salt. Stir with a spatula until no dry spots remain. The batter will be thick but scoopable.
• Taste and adjust: For stronger banana flavor, add a few more drops of banana extract. For sweeter muffins, add an extra tablespoon of sweetener.
• Fold in extras: If using chocolate chips or chopped peanuts, fold them in gently.
• Portion the batter: Divide evenly among the muffin cups, filling each about 3/4 full. Smooth the tops with a spoon if needed.
• Bake: Bake 16–20 minutes, until the tops are set and a toothpick comes out with a few moist crumbs. Do not overbake—almond flour browns quickly.
• Cool: Let muffins cool in the pan 5 minutes, then transfer to a wire rack to cool completely. They firm up as they cool.

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What Makes This Recipe So Good

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• True banana flavor, low carb: We use ripe banana in a small amount plus banana extract to keep carbs down while keeping that familiar taste.
• Protein and healthy fats: Peanut butter and eggs create a satisfying, stick-with-you texture without needing flour.
• Gluten-free and grain-free: Almond flour and a touch of coconut flour make them fluffy with a tender crumb.
• One-bowl convenience: Minimal dishes, maximum payoff. Stir, scoop, bake.
• Customizable sweetness: Use your favorite keto sweetener and adjust to taste.

Ingredients

• 3 large eggs, room temperature
• 1/2 cup creamy natural peanut butter (no sugar added), well-stirred
• 1/3 cup granular or powdered erythritol/monk fruit blend (or to taste)
• 1/4 cup unsweetened almond milk (or unsweetened coconut milk)
• 1/4 cup avocado oil or melted butter, cooled
• 1/3 of a medium ripe banana, well-mashed (about 35–40 g)
• 1 teaspoon banana extract (plus more to taste)
• 1 teaspoon vanilla extract
• 1 1/2 cups fine almond flour
• 2 tablespoons coconut flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon fine sea salt
• Optional mix-ins: 1/4 cup sugar-free chocolate chips, chopped peanuts, or a sprinkle of cinnamon

Step-by-Step Instructions

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1. Prep the pan: Heat the oven to 350°F (175°C).

   Line a 12-cup muffin tin with paper liners or grease well.

2. Whisk the wet base: In a large bowl, whisk eggs until smooth. Add peanut butter, sweetener, almond milk, oil, mashed banana, banana extract, and vanilla. Whisk until creamy and fully combined.
3. Combine the dry ingredients: In the same bowl, add almond flour, coconut flour, baking powder, baking soda, and salt.

   Stir with a spatula until no dry spots remain. The batter will be thick but scoopable.

4. Taste and adjust: For stronger banana flavor, add a few more drops of banana extract. For sweeter muffins, add an extra tablespoon of sweetener.
5. Fold in extras: If using chocolate chips or chopped peanuts, fold them in gently.
6. Portion the batter: Divide evenly among the muffin cups, filling each about 3/4 full.

   Smooth the tops with a spoon if needed.

7. Bake: Bake 16–20 minutes, until the tops are set and a toothpick comes out with a few moist crumbs. Do not overbake—almond flour browns quickly.
8. Cool: Let muffins cool in the pan 5 minutes, then transfer to a wire rack to cool completely. They firm up as they cool.

Storage Instructions

• Room temperature: Store in an airtight container for up to 2 days.
• Refrigerator: Keep in a sealed container up to 6 days.

  Warm briefly in the microwave or toaster oven for best texture.

• Freezer: Freeze on a sheet pan until solid, then store in a freezer bag for up to 3 months. Thaw overnight in the fridge or reheat from frozen at 300°F (150°C) for 10–12 minutes.

Why This is Good for You

• Balanced macros: Peanut butter and eggs deliver protein and healthy fats to keep you satisfied longer and help avoid blood sugar swings.
• Lower sugar load: Using keto sweeteners and a small amount of banana keeps net carbs in check while delivering flavor.
• Nutrient-dense flours: Almond flour brings vitamin E and magnesium, while coconut flour adds fiber for better satiety.
• Gluten-free friendly: Naturally free of wheat and grains, great for gluten-sensitive eaters.

What Not to Do

• Don’t skip the liners or oil: Nut flour muffins can stick. Use liners or grease the pan well.
• Don’t overbake: Dry, crumbly muffins happen fast.

  Pull them when a toothpick has moist crumbs, not a dry tip.

• Don’t overuse banana: More banana means more carbs and a heavier texture. Rely on banana extract for flavor.
• Don’t overmix: Stir until just combined to keep the crumb tender.
• Don’t use conventional sweetened peanut butter: Added sugar spikes carbs and can change the bake time and texture.

Alternatives

• Nut butter swap: Use almond butter or sunflower seed butter (for nut-free).

  Note: sunflower seed butter can react with baking soda and turn green—harmless and kind of fun.

• Flour swap: For a coconut-free option, skip coconut flour and add 1/4 cup more almond flour. Texture will be slightly denser.
• Dairy-free: Use avocado oil instead of butter and dairy-free chocolate chips if adding.
• Sweetener options: Allulose gives a softer crumb and less cooling effect than erythritol. If using pure allulose, increase by about 25% for the same sweetness.
• Flavor twists: Add 1 teaspoon cinnamon, a pinch of nutmeg, or a few chopped roasted peanuts on top for crunch.

FAQ

Are these muffins truly keto if they contain banana?

Yes.

The recipe uses a small amount of ripe banana for authentic flavor and balances it with banana extract. Portion size matters. Most of the sweetness comes from keto-friendly sweeteners, keeping net carbs low per muffin.

Can I make them without banana at all?

You can.

Omit the banana and increase banana extract to taste, usually 1 1/2 to 2 teaspoons. Add 1–2 tablespoons extra almond milk if the batter feels too thick.

How do I prevent gritty texture with almond flour?

Use a fine, blanched almond flour (not almond meal). Mix just until combined and let the batter rest 3–5 minutes before scooping to hydrate the coconut flour.

Why did my muffins sink in the middle?

That usually means underbaking, too much leavening, or opening the oven door early.

Measure baking powder and soda carefully, and bake until the centers spring back lightly when touched.

Can I use peanut butter powder instead of peanut butter?

You can replace up to half the peanut butter with reconstituted peanut butter powder to reduce fat, but the texture will be drier. Add a tablespoon of oil if needed.

What’s the best way to reheat these?

For the best texture, warm in a 300°F (150°C) oven for 6–8 minutes. A quick 10–15 seconds in the microwave works in a pinch but can soften the tops.

Wrapping Up

These keto peanut butter banana muffins bring comfort-food flavor without the sugar spike.

They’re simple to make, easy to customize, and perfect for meal prep. Keep a batch on hand for busy mornings or afternoon cravings, and enjoy a soft, nutty, banana-kissed bite any time.