Marshmallow Toffee Blondies

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I love a dessert that feels indulgent without fuss, and these Marshmallow Toffee Blondies hit that sweet spot. They’re chewy, buttery, and studded with mini marshmallows, chocolate chips, and toffee for crunchy, caramel pockets in every bite. They bake in a single pan and keep well, which makes them perfect for a casual get-together or a last-minute dessert emergency.

The build is simple: a brown sugar–forward batter for deep, caramel-like flavor, melted butter for richness, and a scattering of mix-ins for texture. A light sprinkle of sea salt on top brings the whole thing into balance—don’t skip it if you like sweet-salty contrasts. Below I walk through the ingredients, exact steps, and smart swaps so you get reliable results every time.

What Goes In

• 2 1/4 cups Kroger all-purpose flour — provides structure for chewy blondies; measure by spooning and leveling for accuracy.
• 1 teaspoon sea salt — enhances flavor and balances the sweetness; some goes in the batter and a little can be sprinkled on top.
• 1/2 teaspoon baking soda — the leavening agent that gives a bit of lift without turning these into cakes.
• 1 1/2 cups packed Kroger light brown sugar — the backbone of flavor; gives moisture and that toffee-like taste.
• 12 tablespoons butter, melted and slightly cooled — adds richness and helps create a dense, chewy crumb; cool slightly so it doesn’t cook the eggs.
• 2 large Kroger eggs, at room temperature — bind the batter and contribute to the tender, chewy texture.
• 2 teaspoons pure vanilla extract — heightens the caramel notes and ties all the flavors together.
• 1 1/4 cups Kroger mini marshmallows — pockets of gooey sweetness; mini size distributes more evenly.
• 1 1/4 cups semi-sweet chocolate chips — melty chocolate pockets that pair perfectly with the toffee.
• 1 cup toffee bits or chopped Heath or Skor candy bars — adds crunchy, buttery caramel bites; chop bars into small pieces if using whole candy.
• Sea salt — for sprinkling on top to finish; a little makes the flavors pop.

How to Prepare Marshmallow Toffee Blondies

1. Preheat the oven to 350°F (175°C). Spray a 9×13-inch baking pan with nonstick cooking spray and set it aside so it’s ready when the batter is done.
2. In a medium bowl, whisk together 2 1/4 cups all-purpose flour, 1/2 teaspoon baking soda, and 1 teaspoon sea salt. Set this dry mix aside.
3. In the bowl of a stand mixer (or a large mixing bowl if using a hand mixer), combine 12 tablespoons melted, slightly cooled butter and 1 1/2 cups packed light brown sugar. Mix on medium speed until smooth and combined, about 1 minute.
4. Add 2 large room-temperature eggs and 2 teaspoons pure vanilla extract to the butter-sugar mixture. Mix until the batter is smooth and homogenous.
5. Reduce the mixer speed to low. Slowly add the dry flour mixture and mix just until combined—stop as soon as you no longer see streaks of flour. Avoid overmixing to keep the blondies tender.
6. Fold in 1 1/4 cups mini marshmallows, 1 1/4 cups semi-sweet chocolate chips, and 1 cup toffee bits (or chopped Heath/Skor) using a rubber spatula. Distribute the mix-ins evenly without breaking up the marshmallows too much.
7. Transfer the batter to the prepared 9×13 pan. Use the spatula to press and smooth the top into an even layer. If you like, sprinkle a little extra sea salt evenly over the top for contrast.
8. Bake in the preheated oven for 30–32 minutes. The top should be light golden brown and the edges will begin to pull away from the pan. A toothpick inserted near the center may come out with a few moist crumbs but not wet batter.
9. Remove the pan from the oven and cool the blondies completely on a wire rack to room temperature. Cooling lets the marshmallows set and makes cleaner slices.
10. Once cooled, cut into squares and serve. Store leftovers as noted below.

Why It’s Crowd-Pleasing

These blondies combine multiple textures—chewy base, gooey marshmallow, melty chocolate, and crunchy toffee—so nearly every bite is interesting. Brown sugar gives a deep, caramel flavor that feels special without complicated techniques. They also scale easily and travel well, making them ideal for potlucks, school events, or casual coffee invites.

Ingredient Swaps & Substitutions

• Butter — can substitute equal amount of clarified butter or melted coconut oil for a slightly different flavor; texture will be similar but flavor shifts.
• Brown sugar — dark brown sugar will add more molasses depth; white granulated sugar will work but will change texture and reduce the toffee notes.
• Toffee bits — if unavailable, increase chocolate chips or use crushed shortbread cookies for crunch.
• Marshmallows — mini marshmallows distribute best; if you only have large marshmallows, chop them into small pieces.
• Chocolate chips — use milk chocolate for a sweeter bite or chopped chocolate bars for bigger pockets of chocolate.

Recommended Tools

• 9×13-inch baking pan — the specified size ensures correct thickness and bake time.
• Stand mixer or hand mixer — makes creaming the butter and sugar faster, but a sturdy whisk and elbow grease will work.
• Rubber spatula — essential for folding mix-ins and smoothing the batter in the pan.
• Wire rack — for even cooling so the blondies set properly.
• Measuring cups and spoons — accurate measurements matter for predictable texture.

Don’t Do This

• Don’t skip cooling. Cutting warm blondies will make a mess; wait until they reach room temperature.
• Don’t overmix the flour. Mixing too long after adding dry ingredients makes dense, tough blondies.
• Don’t use piping-hot melted butter. If it’s too hot it can cook the eggs; let it cool slightly before mixing.
• Don’t ignore the salt. A light sprinkle of sea salt on top brightens flavors—skip it only if you absolutely can’t have salt.

Holiday-Friendly Variations

Winter Party

• Add 1/2 cup chopped peppermint bark and swap half the chocolate chips for white chocolate for a festive touch.

Autumn Treat

• Stir in 1 teaspoon ground cinnamon and 1/2 teaspoon ground nutmeg to the dry mix for warm spice notes.

Birthday or Celebration

• Fold in rainbow sprinkles (use sparingly to avoid affecting texture) and top with a few mini marshmallows before baking for a playful look.

Flavor Logic

Brown sugar contributes moisture and a butterscotch depth that pairs naturally with toffee. Melted butter ensures a dense, fudgy crumb rather than cakey. Marshmallows bring pockets of soft, creamy contrast while the toffee adds crunchy, caramelized shards—together they create layered texture. Sea salt balances the sweetness and highlights the chocolate and toffee notes.

Save for Later: Storage Tips

• Room temperature: Store blondies in an airtight container for up to 3 days. Keep layers separated with parchment if stacking.
• Refrigerator: They’ll keep 5–7 days in an airtight container; allow to come to room temperature or warm briefly before serving to soften the marshmallows.
• Freezer: Wrap individual squares tightly in plastic wrap and place in a freezer bag for up to 3 months. Thaw at room temperature or microwave briefly to soften.

Quick Questions

• Can I use margarine or vegan butter? Yes, but flavor and texture will shift slightly; use a firm, block-style vegan butter and keep measurements the same.
• How do I know when they’re done? Look for a light golden top and edges pulling from the pan; a toothpick may show a few moist crumbs but not wet batter.
• Why do the marshmallows sometimes sink? Mini marshmallows distribute evenly; if pieces are large, chop them and fold gently so they stay suspended.

Bring It to the Table

Serve these blondies room temperature with a scoop of vanilla ice cream for an easy dessert crowd-pleaser. They also pair well with coffee or a glass of cold milk. Cut into small squares for parties or larger bars for a dessert plate—either way they travel and stack nicely in a container for potlucks. Enjoy the mix of gooey marshmallow and crunchy toffee—simple, satisfying, and reliably delicious.

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