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Golden, gooey, and studded with melting peanut-butter cups, these blondies walk the line between weeknight dessert and special-occasion show-stopper. A whisper of flaky sea salt on top turns every bite into the perfect salty-sweet experience you never knew you needed.
Why This Recipe Lives on My “Forever” List
I first baked these blondies the night before my sister’s baby shower. The kitchen smelled like a peanut-butter cookie factory had collided with a caramel studio—sweet, nutty, and just a little addictive. I sliced them at 9 p.m., thinking I’d tuck the pan away for the party. By 9:30 half the batch had mysteriously disappeared (my husband still claims “the dog did it”). Since then they’ve become the dessert I bring to new neighbors, the treat I mail to college friends, and the square I stash in my freezer for emergency chocolate cravings. They travel like champions, slice cleanly, and look bakery-perfect even when you’re wearing sweats and a messy bun. If you need a dessert that feels like a giant hug, start here.
Why This Recipe Works
- Browned Butter Base: Cooking the butter until the milk solids toast adds deep, nutty notes that amplify the peanut-butter flavor.
- Two Sugars, Two Textures: A higher ratio of brown sugar keeps the centers chewy, while a touch of granulated sugar gives the tops that delicate, paper-thin crust.
- Chilled Peanut-Butter Cups: Freezing the candies for 15 minutes prevents them from melting into oblivion; you get distinct molten pockets instead of swirl streaks.
- Under-Bake Slightly: Pulling the pan when the edges are set but the center still jiggles guarantees that coveted fudgy blondie bite.
- Flaky Sea-Salt Finish: A light sprinkle right out of the oven balances sweetness and heightens all the flavors—think salted caramel, but in bar form.
- One-Bowl Wonder: No mixer required; the entire batter comes together with a whisk and a silicone spatula—less mess, less stress.
Ingredients You'll Need
Quality matters here. Because the ingredient list is short, each component has a chance to shine. Here’s what to look for—and what you can swap in a pinch.
- Unsalted Butter: European-style (82% fat) browns more evenly and tastes richer. If you only have salted butter, omit the ½ tsp salt in the batter.
- Light Brown Sugar: Make sure it’s fresh and soft; hardened sugar creates dry blondies. Dark brown works too, lending deeper molasses notes.
- Granulated Sugar: Just a ¼ cup keeps the tops delicate. Organic cane sugar is fine, but avoid coarse raw sugar—it won’t dissolve fully.
- Eggs: Room-temperature eggs emulsify better with the warm butter. If you forgot to pull them ahead, submerge cold eggs in warm tap water for 5 minutes.
- Pure Vanilla Extract: Skip imitation; you want those aromatic top-notes. In a pinch, bourbon or dark rum adds a caramel undertone.
- All-Purpose Flour:
- Baking Powder: Check the expiration date; old leavener = dense blondies.
- Salt: Fine sea salt in the batter dissolves quickly; reserve flaky salt for finishing.
- Peanut-Butter Cups: Miniatures save chopping time. If you only have full-size, chill and quarter them. Natural peanut-butter cups (the kind you find in the refrigerated section) melt faster—still delicious, just messier.
- Flaky Sea Salt: Maldon or fleur de sel provides delicate crunch without harsh salinity.
How to Make Peanut Butter Cup Blondies with Sea Salt
Brown the Butter
Place ¾ cup (170 g) unsalted butter in a light-colored saucepan over medium heat. Swirl occasionally as it foams. Once the milk solids turn chestnut-brown and the aroma smells nutty (about 5–7 minutes), pour into a heat-proof bowl to stop cooking. Cool 10 minutes; you need it warm-not-hot so it doesn’t scramble the eggs.
Prep Pan & Oven
Preheat oven to 350°F (175°C). Line an 8×8-inch metal pan with parchment, leaving overhang handles. Lightly grease any exposed sides. Metal pans give chewier edges than glass; if glass is all you have, reduce temperature to 325°F.
Combine Wet Ingredients
Whisk 1 cup (200 g) packed light brown sugar, ÂĽ cup (50 g) granulated sugar, and 2 large eggs into the cooled browned butter until glossy. Whisk in 2 tsp pure vanilla extract.
Fold in Dry Ingredients
Sprinkle 1 cup (128 g) all-purpose flour, 1 tsp baking powder, and ½ tsp fine sea salt over the wet mixture. Using a silicone spatula, fold just until streaks of flour disappear. Over-mixing develops gluten and yields cakey bars.
Add Peanut-Butter Cups
Toss 1 cup (about 24) mini peanut-butter cups with 1 tsp flour (this keeps them from sinking). Reserve 8 for pressing on top; fold the rest into the batter.
Transfer & Top
Spread batter evenly into the prepared pan. The mixture will be thick; use an offset spatula or damp fingers to press it into corners. Press reserved candies on top for photo-ready polka dots.
Bake to Gooey Perfection
Bake 24–27 minutes, rotating halfway. You want golden edges, a set top, and a slight jiggle in the center. Carry-over heat will finish baking as they cool; over-baking is the #1 blondie sin.
Salt & Cool
Immediately dust with ½ tsp flaky sea salt. Let bars cool in the pan 1 hour; the residual heat finishes setting the centers. Use parchment handles to lift onto a cutting board.
Slice Like a Pro
For pristine cuts, chill 20 minutes, then use a large chef’s knife dipped in hot water and wiped clean between slices. Wipe any gooey peanut-butter filling off the blade for bakery-perfect squares.
Expert Tips
Butter Temp Check
After browning, the butter should register 140–150°F on an instant-read thermometer. Too hot and you’ll scramble eggs; too cool and the sugar won’t dissolve properly.
Size Matters
An 8×8 pan yields thick, fudgy blondies. Double the recipe for a 9×13 pan, but reduce oven temperature to 325°F and add 5–8 extra minutes.
Candy Insurance
Pop peanut-butter cups in the freezer while the butter browns. Cold candy holds shape longer, so you get molten pockets instead of smears.
Make-Ahead Magic
Batter can be mixed, poured into the pan, wrapped tightly, and refrigerated up to 24 hours. Bake straight from cold; add 2 extra minutes.
Chewier Texture Hack
Swap 1 Tbsp flour for 1 Tbsp cornstarch. The small starch granules inhibit gluten, yielding a more tender, bakery-style chew.
Flavor Boost
Add 1 tsp espresso powder to the dry ingredients. You won’t taste coffee, but the bitterness amplifies peanut-butter and caramel notes.
Variations to Try
- Almond Joy Blondies: Replace peanut-butter cups with mini dark-chocolate coconut candies and swap ÂĽ cup flour for toasted almond flour.
- Gluten-Free: Use a 1:1 gluten-free baking blend with xanthan gum. Chill batter 10 minutes before baking to hydrate the starches.
- Dairy-Free: Substitute refined coconut oil for butter; brown it the same way for nutty aroma. Use dairy-free chocolate-peanut-butter cups.
- Spiced Fall Version: Add ½ tsp cinnamon, ¼ tsp nutmeg, and fold in butterscotch chips alongside the peanut-butter cups.
- Snickers-Style: Stir in ½ cup chopped roasted peanuts and ½ cup mini marshmallows in the last minute of mixing for gooey nougat vibes.
- Mega-Chewy: Replace half the granulated sugar with mild honey; the hygroscopic nature of honey keeps them moist for days.
Storage Tips
Room Temperature: Once fully cool, store cut bars in an airtight container up to 4 days. Place parchment between layers to prevent sticking. Warm individual squares 8 seconds in the microwave for that fresh-from-the-oven gooeyness.
Refrigerator: For ultra-chewy texture, refrigerate up to 1 week. Wrap each bar in plastic wrap, then place in a zip-top bag to prevent drying. Serve at room temp or warmed 10 seconds in the microwave.
Freezer: Wrap entire slab (uncut) in plastic, then foil, and freeze up to 3 months. Or freeze individual squares on a tray, then transfer to a bag for grab-and-go treats. Thaw overnight in the fridge or 30 minutes at room temp.
Make-Ahead Batter: Mix batter, spread in pan, cover tightly, refrigerate up to 24 hours. Bake as directed, adding 2 minutes. Alternatively, bake, cool, and freeze whole pan; thaw 2 hours at room temp before slicing.
Frequently Asked Questions
Peanut Butter Cup Blondies with Sea Salt
Ingredients
Instructions
- Brown the Butter: Melt butter in a light-colored saucepan over medium heat, swirling until milk solids turn chestnut-brown and aroma is nutty, 5–7 min. Pour into a bowl; cool 10 min.
- Prep: Preheat oven to 350°F (175°C). Line an 8×8-inch metal pan with parchment, leaving handles.
- Wet Mix: Whisk sugars, eggs, and vanilla into warm browned butter until glossy.
- Dry Mix: Fold in flour, baking powder, and salt just until streaks disappear.
- Add Candy: Toss mini peanut-butter cups with 1 tsp flour; fold most into batter. Reserve 8 for topping.
- Bake: Spread batter evenly, press reserved candies on top, and bake 24–27 min, until edges are set and center jiggles slightly.
- Finish: Immediately sprinkle flaky sea salt. Cool in pan 1 hour, then lift out and slice.
Recipe Notes
For clean cuts, chill 20 min and use a hot knife. Store airtight up to 4 days at room temp or 1 week refrigerated. Freeze up to 3 months.
