Fluffernutter Bars

Fluffernutter Bars

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Irresistible Fluffernutter Bars: Your New Favorite No-Bake Treat!

Effortless Fluffernutter Bars deliver a nostalgic treat, bringing together the iconic combination of peanut butter and marshmallow creme in a convenient, no-bake format.

This recipe uses just 7 common pantry ingredients and comes together in less than 15 minutes of active prep, making it ideal for quick assembly.

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Each bar features a rich, dense peanut butter base, crafted for a perfect balance of sweet and salty notes.

This firm base is then crowned with a light, fluffy layer of marshmallow creme, providing a soft, yielding contrast.

The no-bake technique ensures a smooth, chewy texture throughout, eliminating the need for an oven.

These bars are perfect for school lunchboxes, adding to a dessert platter for potlucks, or serving as a satisfying afternoon snack.

They also make a great make-ahead option, as they set beautifully in the refrigerator.

Fluffernutter Bars

Fluffernutter Bars
Fluffernutter Bars

Combine graham cracker crust, peanut butter filling, and toasted marshmallow topping.

Prep time:25 min
Cook time:28 min
Total time:3 hr 53 min
Servings:24 bars

Ingredients

For the Graham Cracker Crust:

  • 1 ½ cups (180g) graham cracker crumbs, finely crushed
  • ½ cup (113g) unsalted butter, melted and cooled slightly
  • ¼ cup (50g) granulated sugar, fine grain

For the Peanut Butter Filling:

  • 1 cup (226g) unsalted butter, softened to room temperature
  • 1 ½ cups (384g) creamy peanut butter, smooth, at room temperature
  • 3 cups (360g) powdered sugar, sifted
  • 1 teaspoon (5ml) vanilla extract
  • ½ teaspoon (2.5ml) fine sea salt
  • ¼ cup (60ml) whole milk, cold

For the Marshmallow Topping:

  • 7 ounces (200g) marshmallow fluff
  • 1 tablespoon (15ml) unsalted butter, melted

Instructions

  1. Preheat Oven: Position oven rack in middle. Preheat oven to 350°F (175°C). Line a 9×13 inch (23×33 cm) baking pan with parchment paper, leaving a 2-inch (5 cm) overhang on long sides. Lightly grease exposed pan sides or parchment.
  2. Prepare Crust: Combine 1 ½ cups (180g) finely crushed graham cracker crumbs, ½ cup (113g) melted unsalted butter, and ¼ cup (50g) granulated sugar in a large bowl. Stir for 1-2 minutes until butter incorporates and crumbs moisten evenly.
  3. Press Crust: Transfer graham cracker mixture to the prepared 9×13 inch (23×33 cm) baking pan. Press mixture firmly and evenly across the pan base with a flat-bottomed glass or measuring cup.
  4. Bake Crust: Bake crust in preheated oven for 8-10 minutes until edges turn light golden brown. Remove pan from oven. Cool on a wire rack for 15 minutes before adding filling.
  5. Prepare Filling: Combine 1 cup (226g) softened unsalted butter and 1 ½ cups (384g) creamy peanut butter in a stand mixer with a paddle attachment (or large bowl with hand mixer). Beat on medium speed for 2-3 minutes until light and fluffy.
  6. Add Dry Ingredients: With mixer on low speed, gradually add 3 cups (360g) sifted powdered sugar to peanut butter mixture. Mix until combined. Increase speed to medium; beat for 1-2 minutes until smooth. Scrape bowl sides with a spatula.
  7. Add Wet Ingredients: Add 1 teaspoon (5ml) vanilla extract and ½ teaspoon (2.5ml) fine sea salt to filling. Blend on low speed for 30 seconds until incorporated. Pour in ¼ cup (60ml) cold whole milk. Increase mixer speed to medium-high; beat for 1-2 minutes until light and smooth.
  8. Assemble Bars: Spoon peanut butter filling over cooled graham cracker crust. Spread filling from edge to edge with an offset spatula or large spoon until smooth and level.
  9. Add Marshmallow Topping: Dollop 7 ounces (200g) marshmallow fluff over the peanut butter layer. Spread to form an even topping. Drizzle 1 tablespoon (15ml) melted unsalted butter over marshmallow fluff.
  10. Toast Topping (Optional): Place baking pan 6-8 inches (15-20 cm) below broiler element. Broil on low heat for 1-3 minutes until marshmallow fluff is golden brown and bubbling. Alternatively, use a kitchen torch to toast until golden.
  11. Chill Bars: Chill baking pan in the refrigerator for 3-4 hours until bars are firm.
  12. Slice and Serve: Lift chilled bars from pan using parchment overhang. Place on a cutting board. Cut into 24 even squares. Wipe knife blade clean between each slice. Serve or store in an airtight container.
See also  Blueberry White Chocolate Chip Cookies

Notes

  • Make Ahead: Prepare bars up to 3 days in advance. Store in an airtight refrigerator container.
  • Storage: Store leftover bars in an airtight refrigerator container for up to 5 days. For longer storage, wrap individual bars tightly in plastic, then freeze in a freezer-safe bag or container for up to 1 month. Thaw in refrigerator before serving.
  • Peanut Butter: Use standard creamy peanut butter, not natural peanut butter, to prevent separation and texture changes.
  • Slicing Tip: Warm knife under hot water and wipe dry between each slice to prevent sticking.
  • Pan Size: Use a 9×13 inch (23×33 cm) baking pan for specified bar thickness. A smaller pan yields thicker bars requiring longer chilling. A larger pan yields thinner bars.
  • Temperature of Ingredients: Bring butter and peanut butter to room temperature. Cold ingredients create a stiff, crumbly mixture.

Nutritional Information (per bar)

  • Calories: 350 kcal
  • Total Fat: 25g
  • Saturated Fat: 10g
  • Trans Fat: 0g
  • Cholesterol: 30mg
  • Sodium: 200mg
  • Total Carbohydrates: 30g
  • Dietary Fiber: 1g
  • Total Sugars: 20g
  • Protein: 7g

Pro Tips for Perfect Fluffernutter Bars Every Time

Ingredient Tips

  • Room Temperature Ingredients:Let butter soften 60 minutes until easily yielding, and marshmallow fluff sit 30 minutes. This ensures smoother blending for the peanut butter layer and effortless, even spreading for both.
  • Finely Crushed Graham Crackers:Process 12-14 full graham cracker sheets for 20-30 seconds until fine and sand-like. This prevents a crumbly base and ensures a uniform 1/4-inch crust.
  • Creamy, No-Stir Peanut Butter:Use 1 full cup (250g) creamy, no-stir peanut butter (e.g., Jif, Skippy). Natural varieties lead to an oily, less cohesive 1/2-inch layer from oil separation.
  • Sifted Powdered Sugar:Sift 1 ½ cups (180g) powdered sugar before mixing. This prevents lumps, yielding a silky-smooth peanut butter layer that spreads effortlessly.
See also  Blackberry Velvet Gothic Cake

Technique Tips

  • Pre-bake the Crust Perfectly:Press crust into a 9×13 inch pan to 1/4-inch thickness. Pre-bake at 350°F (175°C) for 8-10 minutes until edges are light golden brown, for enhanced flavor and no sogginess.
  • Smooth Peanut Butter Layer:Cool crust 15-20 minutes. If PB mixture is stiff, microwave 10-second intervals (max 30 seconds) until it slides off a spoon. Spread evenly to a uniform 1/2-inch layer.
  • Broil Fluff to Golden Perfection:Place under a preheated broiler on high, 6-8 inches from element. Broil 45-90 seconds, turning pan every 20-30 seconds, until deeply golden brown with toasted peaks. Watch vigilantly.
  • Cool and Cut Precisely:Cool bars at room temperature 1 hour, then refrigerate 2-3 hours for clean cuts. Use a sharp knife heated under hot water for 30 seconds, wiped clean between each 1.5-inch cut; yields 36 neat bars.

Common Issues

  • Crumbly Crust:If crumbs don’t hold when squeezed, add 1-2 tablespoons more melted unsalted butter. Apply 5+ pounds of force for 1 minute with a measuring cup for firm compaction.
  • Stiff or Greasy PB Layer:If PB layer is stiff, add 1-2 tablespoons whole milk/cream until spreadable. If greasy (from natural PB), add extra 1/4 cup (30g) sifted powdered sugar to absorb excess oil.
  • Fluff Sinks or Deflates:Ensure fluff layer is no more than 3/4 inch thick. Broil only until deeply golden brown (typically 90 seconds). Over-broiling collapses air pockets, resulting in a denser layer.
  • Bars Too Sticky to Cut:Refrigerate for a full 4 hours or overnight if kitchen is warm. For each cut, dip a sharp knife into very hot water for 20 seconds, wipe dry, then slice. Repeat for pristine 1.5-inch edges.
See also  Lemon Meringue Pie Cookies

Fluffernutter Bar Variations & Storage

Fluffernutter bars allow for specific flavor modifications and require precise storage techniques to maintain optimal texture and freshness.

Bar Variations

After combining 0.5 cups (112g) melted butter, 0.5 cups (100g) granulated sugar, and 1 cup (250g) peanut butter, integrate 0.5 cups (85g) mini chocolate chips into the base mixture. Stir for 15-20 seconds to evenly distribute chips; press into a 9×13 inch pan for a uniform 0.5-inch layer.

Melt 2 oz (56g) semi-sweet chocolate chips over medium heat for 3-4 minutes until smooth. Drizzle immediately in 6-8 lines over the marshmallow layer. Swirl 5-6 times with a toothpick, creating distinct marbled patterns.

Substitute 1 cup (250g) almond butter or cashew butter for 1 cup (250g) peanut butter in the base. After adding 1.5 cups (180g) powdered sugar, stir until the mixture thickens to a firm, crumbly consistency within 30 seconds. Press evenly into an 8×8 inch pan for a 1-inch thick layer.

After bars set for 30 minutes at room temperature, place under a broiler. Broil on high for 45-90 seconds at 6 inches (15cm) distance from the heating element. Watch until marshmallow peaks acquire a golden brown color and a slightly puffed, caramelized texture across the surface.

Reduce peanut butter to 0.75 cups (188g). Fold in 1 cup (28g) crushed Rice Krispies or Corn Flakes into the base mixture. Mix for 20-30 seconds until evenly coated, forming a thick, moldable dough. Press into a 9×13 inch pan for a 0.5-inch uniform thickness.

Warm 0.25 cups (60ml) salted caramel sauce to 90°F (32°C) for pourable consistency. Drizzle in 10-12 thin lines across the set marshmallow layer. Allow to set for 15 minutes at room temperature until firm to the touch before slicing.

Storage Recommendations

Store completely cooled bars in an airtight container at 68-72°F (20-22°C) for up to 3 days. Verify a firm, non-sticky surface before serving.

Refrigerate bars for extended freshness. Cut into 1.5-inch squares. Arrange in single layers or stack with 2-3 sheets of parchment paper between layers in an airtight container. Refrigerate at 35-40°F (2-4°C) for up to 1 week. Allow 15 minutes at room temperature before consumption for softer texture.

For long-term storage, freeze bars. Cut cooled bars into individual 2×2 inch portions. Wrap each tightly in plastic wrap, ensuring zero air exposure. Place wrapped bars into a heavy-duty freezer-safe bag or an airtight container. Freeze at 0°F (-18°C) or colder for a maximum of 2 months. Thaw at room temperature for 1-2 hours until soft, or thaw overnight (8-10 hours) in the refrigerator.