Step-by-Step Instructions
1. Make the Bars
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Preheat oven to 350°F (175°C). Grease a 9×13-inch baking dish or line it with parchment paper.
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In a large bowl, cream together the butter, peanut butter, and sugar until smooth and fluffy.
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Beat in the eggs one at a time, then add vanilla.
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Stir in the flour and salt until just combined — don’t overmix.
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Spread the thick batter evenly into the prepared pan.
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Bake for 25–30 minutes, or until the edges are set and a toothpick comes out mostly clean (slightly underbaked gives the best chewy texture).
2. Prepare the Frosting
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In a medium bowl, whisk together melted butter, peanut butter, and vanilla.
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Gradually add powdered sugar, alternating with milk, until you reach a creamy, spreadable consistency.
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Taste and adjust sweetness or thickness as needed.
3. Assemble
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Let the bars cool for about 10–15 minutes after baking (they should still be slightly warm).
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Spread the frosting generously over the bars — the warmth helps it melt into a luscious glaze.
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Allow to cool completely before slicing into squares.
Tips for Success
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Don’t skip the frosting. It’s what gives these bars their signature “lunch lady” vibe.
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Try chunky peanut butter if you like a little crunch in every bite.
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Add a chocolate drizzle over the frosting for a peanut butter cup twist.
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Store in an airtight container at room temperature for up to 3 days (or refrigerate for up to a week).
Final Thoughts
Peanut Butter Lunch Lady Bars are proof that the simplest ingredients can make the most memorable desserts. They’re nostalgic, easy to whip up, and absolutely irresistible. Whether you serve them at a gathering or keep the whole pan for yourself (we won’t judge), this recipe is sure to become a household favorite.
