These Salted Toasted Milk Caramel Blondies might be my dream blondie. They’re thick and chewy with brown butter, toasted milk powder, ribbons of homemade salted toasted-milk caramel, and flaky salt on top. Toasting the milk powder intensifies those nutty, caramelized milk-solid flavors we love in brown butter, so the entire thing essentially tastes like brown butter on brown butter in the best possible way.

And if you’ve never baked with toasted milk powder before, this is the recipe I would start with. It takes inexpensive nonfat dry milk powder and turns it into an ingredient that tastes deeply nutty, caramelized, and almost malted.

The best part is that we’re using it twice. It goes directly into the brown butter blondie batter, then again into the homemade salted caramel. Every component reinforces the same toasted flavor without needing chocolate, spices, or a ton of other additions competing with it.

Why You’ll Love These Blondies

These aren’t regular blondies with caramel poured on top. Toasted milk is built into every layer.

The blondie itself is thick, chewy, and packed with brown butter and toasted milk powder. The homemade caramel gets another dose of toasted milk, then gets swirled directly into the batter before baking. The rest is reserved for drizzling over the finished blondies with flaky salt.

They’re sweet, salty, buttery, incredibly chewy, and full of that deep toasted dairy flavor that makes brown butter so good in the first place.

What Is Toasted Milk Powder?

This is one of those baking ingredients that sounds much more complicated than it actually is.

You start with regular nonfat dry milk powder. Spread it onto a baking sheet and toast it in the oven until the pale powder becomes deeply golden and smells nutty.

Milk powder contains the milk solids that give browned butter so much of its flavor. By toasting those solids separately, we can create that same kind of caramelized, nutty dairy flavor and add much more of it to a recipe.

That’s why I keep describing these as essentially double brown butter blondies. We’re browning the milk solids naturally present in the butter, then adding a whole bunch of separately toasted milk solids right back in.

How to Toast Milk Powder

You do not need to buy something specifically labeled “toasted milk powder.”

Regular nonfat dry milk powder is exactly what you want.

Spread ½ cup (about 45–50 g) nonfat dry milk powder in a thin, even layer on a parchment-lined rimmed baking sheet.

Bake at 300°F for 20–30 minutes, stirring thoroughly after the first 10 minutes and then every 5 minutes.

The powder will gradually change from pale cream to golden beige. You’re looking for a deep toasted beige/light caramel color and a noticeably nutty aroma.

Don’t walk away toward the end. Milk solids can go from beautifully toasted to burnt, and burnt milk powder will taste bitter.

The powder may also form some clumps while it bakes. That’s normal. Once cooled, pulse it briefly in a food processor or blender, or push it through a fine-mesh sieve, to return it to a fine powder.

Important: Throughout this recipe, whenever I say “toasted milk powder,” I mean nonfat dry milk powder after it has been toasted using this method.

Why Brown Butter + Toasted Milk Work So Well Together

Brown butter gets its signature flavor when the milk solids in butter toast and caramelize.

Toasted milk powder lets us take that idea even further.

Instead of relying solely on the relatively small amount of milk solids naturally contained in a stick of butter, we’re adding additional toasted milk solids directly to the batter.

The result isn’t simply “more buttery.” It’s nuttier, toastier, more caramelized, and more complex.

If you’re someone who already puts brown butter in everything, toasted milk powder is absolutely an ingredient worth knowing about.

The Salted Toasted Milk Caramel

I didn’t want regular caramel competing with the toasted milk flavor, so the caramel gets its own dose of toasted milk too.

Rather than whisking dry milk powder straight into finished caramel, the toasted milk powder gets whisked into warm heavy cream first. That helps it dissolve more evenly and gives the cream itself a toasted flavor before it ever meets the caramelized sugar.

Part of the caramel gets swirled into the blondie batter before baking. The rest gets reserved for finishing.

You don’t want to pour all of the caramel into the blondies. Too much can interfere with how the center sets and turn them overly sweet. A few deliberate ribbons give you pockets of gooey caramel while still letting the chewy blondie remain the star.

How to Get Thick, Chewy Blondies

There are a few things working in our favor here.

First, we’re baking these in an 8×8-inch pan rather than spreading the batter thin. That gives us those substantial bakery-style squares.

Second, once the flour goes in, stop mixing as soon as it’s incorporated. Overmixing encourages more gluten development and can push the texture away from the dense, chewy blondie we’re after.

And most importantly: don’t overbake them.

A toothpick does not need to come out completely clean. Moist crumbs are exactly what you want. The center will continue setting as the blondies cool.

Common Mistakes to Avoid

Burning the milk powder: Stir frequently, especially toward the end. You’re looking for deeply golden, not dark brown.

Burning the brown butter: Once the milk solids become golden brown and smell nutty, remove the pan from the heat. They’ll continue cooking briefly from residual heat.

Adding cold cream to caramel: Warm the heavy cream first. Cold liquid hitting extremely hot caramel can cause the sugar to seize and creates much more aggressive bubbling.

Using too much caramel in the batter: More isn’t necessarily better here. Keep the swirl controlled and save the rest for serving.

Over-swirling: A few broad passes with a knife are enough. If you mix endlessly, you’ll lose the defined caramel pockets.

Overbaking: Pull these when the edges are set and the center is baked but still soft. A toothpick should have moist crumbs rather than coming out bone-dry.

Cutting while they’re hot: I understand the temptation. Don’t do it. The blondies need cooling time to finish setting and develop that dense, chewy texture.

Frequently Asked Questions

Can I use regular milk powder without toasting it?

Technically, yes, but you would lose the defining flavor of this recipe. Toasting the milk powder is what creates that deep, nutty, caramelized dairy flavor.

Does the milk powder need to be nonfat?

Nonfat dry milk powder is ideal here because it gives us concentrated milk solids without introducing additional fat that could change the texture of the blondies.

Can I toast the milk powder ahead of time?

Absolutely. Toast it, cool it completely, process or sift out the clumps, and store it in an airtight container until you’re ready to bake.

Why did my toasted milk powder clump?

Totally normal. The powder can form little clusters as it heats. Once it has cooled, pulse it in a food processor or blender or push it through a fine-mesh sieve.

Can I skip the caramel swirl and put all the caramel on top?

You could, but I wouldn’t. Those little caramel pockets throughout the blondies are part of what makes the finished texture so good.

How do I know when the blondies are finished?

The edges should be set and lightly golden, and the center should no longer look like raw batter. A toothpick inserted into an area without a caramel pocket should come out with moist crumbs.

How to Store

Store the blondies in an airtight container at room temperature for about 2 days or refrigerate for up to 5 days.

If refrigerated, let them come toward room temperature before serving for the best chewy texture, or warm one very briefly before adding extra caramel.

Keep leftover toasted-milk caramel refrigerated in a sealed container.

Make Ahead

The toasted milk powder is the easiest component to make ahead. Toast it several days in advance and keep it tightly covered.

You can also make the salted toasted-milk caramel ahead and refrigerate it. Gently warm it until pourable before swirling or serving.

The finished blondies can be baked a day ahead. In fact, once completely cool and set, they’re especially easy to cut into clean squares.

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More recipes to try…

• Mini Pumpkin Loaves with Toasted Marshmallow Frosting
• Maple Brown Butter Blondies
• Brown Butter White Chocolate Blondies with Blueberry Swirl
• Salted Caramel Cream Puffs
• Salted Caramel Pastry Cream