Desserts Images are for illustrative purposes only, may be inaccurate, and do not guarantee the presence or absence of specific ingredients. 
Serving Images are for illustrative purposes only, may be inaccurate, and do not guarantee the presence or absence of specific ingredients. Peanut Butter Squares
Chewy peanut butter oat bars topped with melted chocolate and a peanut butter glaze.
Contains common allergens
In the app, Listahan checks these against your household automatically.
Instructions
7 steps- 1
Preheat the oven to 350°F (175°C) and grease a 13x9-inch pan. In a large bowl, cream the margarine with the brown and white sugars until light.
- 2
Blend in the egg, then add the 1/2 cup peanut butter and the vanilla, mixing until smooth.
- 3
Stir in the flour, quick oats, baking soda, and salt until combined. Spread the dough evenly into the prepared pan.
- 4
Bake for 20 to 25 minutes, until the edges are golden and the center is set.
- 5
While still hot, sprinkle the chocolate chips over the top; let them soften for a minute, then spread into an even layer.
- 6
Make the icing by stirring together the 1/4 cup peanut butter, powdered sugar, and milk until smooth. Swirl over the melted chocolate.
- 7
Let cool completely, then cut into squares.
Images are for illustrative purposes only, may be inaccurate, and do not guarantee the presence or absence of specific ingredients. Listahan Family Score™
67/100
Works for many families
Score reflects how well this recipe fits a typical busy household. In the app, your Family Score is personalized to your household's allergens, kids, and pantry.
Nutrition
per serving305
Calories
6 g
Protein
38 g
Carbs
15 g
Fat
Estimated per serving. Actual values depend on the brands and portions you use.
Listahan cooking guide
Chef notes & practical guide
Technique notes, ingredient swaps, serve-alongside ideas, storage guidance, and equipment for this recipe.
Cultural context
Peanut butter bars and squares belong to a category of American bake-sale and potluck desserts that surged in popularity during the mid-20th century as peanut butter became a household staple. The oat base layered with chocolate and peanut butter icing is a close relative of the no-bake Scotcheroo and the baked peanut butter oat bar common in Midwestern community cookbooks from the 1950s onward. The defining character of the form is the combination of a cookie-like oat base baked until just firm, topped with a chocolate and peanut butter glaze that sets while cooling.
Listahan note
This version bakes the oat-peanut butter dough into a chewy, not crispy, base by using quick oats and pulling the pan from the oven before the edges are fully set, then tops it while warm so the chocolate chips melt into a glossy layer.
Technique cues
- Quick oats rather than old-fashioned rolled oats are essential to the texture; rolled oats produce a chewier, more toothsome bar with defined oat pieces, while quick oats bind into a softer, more uniform sheet that cuts cleanly. Use what the recipe specifies for the intended result.
- The chocolate chip layer relies on residual heat from the baked base to melt without additional cooking. Scatter chips immediately after the pan comes out of the oven and let sit 2-3 minutes before spreading; waiting too long means the pan cools and the chips do not melt fully.
- The peanut butter in the icing should be at room temperature and thoroughly beaten into the powdered sugar before milk is added; adding milk too early thins the icing before the peanut butter is fully incorporated and produces a grainy, broken texture.
Kitchen flow
- Parallel prep
- Make the peanut butter icing while the base bakes and the chocolate chips are melting. By the time the chocolate is spread, the icing will be ready to go on top.
- Make-ahead
- Fully assembled bars keep well; bake a day ahead and refrigerate overnight for the cleanest cuts. The icing sets firmer when cold, preventing smearing during slicing.
- Leftover move
- Crumble leftover bars into vanilla ice cream and stir to make a peanut butter-chocolate chunk ice cream mix-in; or layer with banana slices and whipped cream for a parfait.
- Cleanup rhythm
- Line the pan with parchment or foil before pressing in the dough for zero-cleanup removal. Soak any peanut butter-icing residue bowls in hot water before washing; peanut butter releases easily once warm.
Ingredient brief
Role, handling, and swap guidance for each key ingredient.
peanut butter
primary flavor in dough and icing
Purpose: Peanut butter appears in both the base dough and the icing, creating a continuous flavor thread that ties the two layers together.
Handling: Use conventional creamy peanut butter (Jif, Skippy) for baking; natural peanut butter with oil separation behaves differently and can make the icing oily.
Adaptation: Sunflower seed butter (SunButter) substitutes 1:1 for a nut-free version that bakes and tastes very similarly.
quick oats
bulk and chew in the base
Purpose: Quick oats provide structure and a slightly chewy, hearty texture while keeping the base tender enough to cut cleanly when cooled.
Handling: Measure straight from the canister; no toasting or pre-cooking needed.
Adaptation: Old-fashioned oats can be used but produce a chewier, more textured bar with a more pronounced oat flavor.
semi-sweet chocolate chips
glossy topping layer
Purpose: Scattered over the hot base, the chips melt into a smooth chocolate layer that sets firm at room temperature, creating a clean top for cutting.
Handling: Have measured and ready to scatter the moment the pan exits the oven; timing is critical for even melting.
Adaptation: Dark chocolate chips (60-70%) reduce the sweetness of the topping and add bitterness to balance the sweet peanut butter icing.
margarine
fat in the dough
Purpose: Softened margarine creams with the sugars and produces a tender, slightly chewy base; it also adds a subtle buttery flavor without the richness of full butter.
Handling: Soften at room temperature; do not melt it, as melted fat produces a flatter, denser base.
Adaptation: Unsalted butter substitutes 1:1 for a richer, fuller flavor profile in the base.
powdered sugar
body and sweetness in the icing
Purpose: Powdered sugar dissolves smoothly into the peanut butter icing without grittiness, producing a thick, spreadable glaze rather than a granular frosting.
Handling: Sift if lumpy before beating into the peanut butter; lumps in a thin icing layer are visible in the finished bar.
Adaptation: No practical substitute; confectioners' sugar is the standard for no-cook icings.
Technique notes
- Press the dough evenly into the pan with damp hands or the back of an oiled measuring cup; uneven thickness means some sections overbake while others underbake.
- Do not cut the bars until the chocolate layer is completely set and the peanut butter icing is firm; cutting warm produces ragged edges where the icing smears. At minimum, cool 30 minutes at room temperature and then 15 minutes in the fridge.
- Run a sharp knife under hot water and dry it between each cut for clean, restaurant-quality edges rather than dragging the chocolate through the peanut butter layer.
Ingredient swaps
- Nut-free direction
- Replace peanut butter in both the dough and the icing with SunButter (sunflower seed butter); the flavor is slightly different but the structure and texture are nearly identical.
- Gluten-free direction
- Use certified GF quick oats and a GF 1:1 flour blend; the base holds together well because the peanut butter provides significant binding.
- Dairy-free option
- Use vegan butter or plant-based margarine in the base, dairy-free chocolate chips (Enjoy Life), and oat milk or almond milk in the icing.
Serve alongside
- a glass of cold milk
- vanilla ice cream with caramel sauce
- sliced bananas with a drizzle of honey
- cold whole milk
- hot coffee or black tea
- chocolate milk
Serving suggestions only — check pairings for your household's allergens.
Storage & reheating
- Store in an airtight container at room temperature for up to 4 days, separated by parchment layers to prevent sticking.
- Refrigerate for up to 1 week; remove 10 minutes before serving for best texture as the chocolate layer becomes very firm when cold.
- Freeze individually wrapped bars for up to 2 months; thaw at room temperature for 45 minutes.
Equipment
- 9x13-inch baking pan
- parchment paper for lining and easy removal
- stand mixer or hand mixer for creaming the dough
- offset spatula for spreading the melted chocolate and icing layers
Make this household-aware
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Plan it in Listahan
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