Cake Mix Toffee Bars

Cake mix toffee bars are dangerously easy. Just five ingredients, one bowl, and zero need to drag out your mixer. With toffee bits and a buttery base, this is your new go-to dessert for bake sales, potlucks, or late-night cravings.

Read more: Cake Mix Toffee Bars

Jump to:

• Ingredients
• Equipment You’ll Need
• Step-by-Step Instructions
• Toffee Bar Recipe Tips
• Storage Instructions
• Recipe Variations
• Cake Mix Recipes
• Sweetened Condensed Milk Desserts
• Pin to Save for Later
• Recipe
• Comments

Ingredients

• 1 (13.25 oz) box yellow or white cake mix
• 1 (8 oz) bag Heath bits (about 1 ⅔ cups)
• 2 large eggs
• 6 tablespoons melted butter
• 1 (14 oz) can sweetened condensed milk

Equipment You’ll Need

• Large mixing bowl
• Spatula or wooden spoon
• 9x13 inch baking pan
• Parchment paper (optional but helpful)
• Metal binder clips to secure parchment (pro tip)

Step-by-Step Instructions

1. Make the base

In a large mixing bowl, stir together the cake mix, one of the eggs, and the melted butter. This dough is on the dry side, so you’ll need to work it a bit to fully combine it.

I ended up pressing a bit of the cake mix in with my hands.

2. Press into the pan

Line your 9x13 pan with parchment paper so the bars are easier to remove and slice.

If you've made my Gooey Butter Cake recipe before, you'll be familiar with using your hands to spread the cake mix over the surface of the cake pan.

I used the heavy can of sweetened condensed milk as a makeshift rolling pin to help press the dough evenly into the pan.

3. Make the topping

In the same mixing bowl, stir together the remaining egg and the full can of sweetened condensed milk until smooth.

Add the Heath bits and stir until evenly combined.

4. Assemble:

Pour the topping mixture over the cake base. Spread the topping gently to cover the entire surface.

5. Bake

Bake the bars at 350°F for 25 to 30 minutes. You’ll know it’s done when:

• The edges are golden brown and slightly pulling away from the pan.
• The topping has turned a caramel brown color.
• Your kitchen smells amazing.
• A digital thermometer reads at least 200F° when you insert it in the center of the bars.

6. Cool Bars

Let cool at room temperature for about an hour before slicing. Toffee bars are easier to slice than most other bars, like my S'mores Bars recipe or Crunchy Sweet Salty Bars.

Toffee Bar Recipe Tips

• The base is fairly dry, so you’ll need to work it into the pan. Next time I make these, I’ll probably bump up the butter slightly — closer to a full stick — to make spreading even easier.
• For nice, clean cuts, I like to use a bench scraper instead of a knife. The flat, wide blade makes it easy to press straight down and get perfect wedges.

Storage Instructions

• Store tightly covered at room temperature for up to 3 days.
• For longer storage, double-wrap the bars and freeze. You should be able to freeze for up to two months.

Recipe Variations

• You can experiment with different cake mix flavors—chocolate cake mix would be phenomenal.
• I don’t recommend doubling the recipe as written; it likely wouldn’t bake evenly.
• I haven’t tested a gluten-free version, so I can’t speak to how it would turn out.

Cake Mix Recipes

If you love cake mix recipes, try baking St. Louis Gooey Butter Cake, Cake Mix Snickerdoodles, Kentucky Butter Cake Cookies and Gooey Butter Cake Cookies.

One of the most popular cookie recipes on Kitchen Serf is Chewy Toffee Cookies, a must bake for toffee lovers. Those were so good I made a Chocolate Toffee cookie and a Toffee Doodle, a cookie that's half snickerdoodle/half toffee!

Sweetened Condensed Milk Desserts

Sweetened condensed milk is the secret ingredient for many desserts, including Cake Mix Toffee Bars, S'mores Bars, Salty, Sweet and Crunchy Bars, Key Lime Bars and Lemon Bars with Graham Cracker Crust.

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