Twix Strikes Dessert Bars

The smell of butter melting into brown sugar still takes me back to my tiny first apartment kitchen, where I made my first batch of these bars. My roommate walked in mid-caramel stir and asked what kind of chemistry experiment I was running. Those first attempts were uneven and slightly burnt, but they disappeared in record time anyway.

I brought these to a potluck last summer and watched my friend Sarah literally sneak seconds off the platter when she thought no one was looking. She later confessed to eating three and taking four home. Now she texts me every time she spots a 9x13 pan at a thrift store.

Ingredients

• Unsalted butter: Use room temperature for the shortbread but cold from the fridge works fine if you are in a hurry
• Granulated sugar: Creates that perfect crisp tender texture in the base
• All purpose flour: No need to sift but do measure by spooning into your cup and leveling off
• Fine sea salt: Balances sweetness without tasting salty
• Light brown sugar: Pack it down firmly in the measuring cup or your caramel will be too thin
• Sweetened condensed milk: Do not accidentally grab evaporated milk like I did once
• Milk chocolate: Ghirardelli chips melt beautifully but whatever you can find works

Instructions

Get your oven ready:

Preheat to 350F and line your pan with parchment letting the ends hang over like handles

Make the shortbread base:

Beat butter and sugar until pale then stir in flour and salt until dough just comes together

Bake the foundation:

Press dough firmly into corners prick all over with a fork and bake 18 to 20 minutes until golden

Start the caramel:

Melt butter in a heavy pot then whisk in brown sugar syrup condensed milk and salt

Cook until thick:

Stir constantly for 7 to 10 minutes until it hits 225F or coats the back of a spoon

Layer the caramel:

Pour evenly over cooled shortbread and let it set for an hour at room temperature

Melt the chocolate:

Heat chocolate and butter together in 20 second bursts stirring between each

Finish the bars:

Spread chocolate smoothly then let set before lifting out and cutting into 16 pieces

Save

My mom called me halfway through my first batch asking what smelled so amazing. She now requests these for every family gathering instead of her famous pecan pie. That is when I knew they were something special.

Getting Clean Cuts

Run your knife under hot water and wipe it dry between every single cut. The chocolate will not stick and you will get those gorgeous clean edges that make them look bakery perfect.

Caramel Troubleshooting

If your caramel seems too thin after cooking just let it cool another 15 minutes before pouring. And if it seizes you can rescue it by adding a splash of cream and whisking over very low heat.

Storage Secrets

These actually taste better on day two when all the layers have had time to become friends. Keep them in a cool spot away from direct sunlight and they will stay perfect for days.

• Refrigerate only if your kitchen runs warm
• Separate layers with wax paper if stacking
• They freeze beautifully for up to a month

Save

There is something deeply satisfying about making something so crave worthy from scratch. Watch them disappear quickly.

Recipe FAQs

→ How long do these bars need to set?

The caramel layer requires about one hour to firm at room temperature before adding chocolate. The final chocolate topping sets in roughly 30 minutes at room temperature or faster if refrigerated. Plan for approximately two hours total time including cooling periods.

→ Can I make these ahead of time?

These bars store beautifully in an airtight container at room temperature for up to five days. The layers remain stable and the texture stays fresh. You can prepare them two days before serving, though they're best within three days for optimal texture.

→ What's the best way to cut clean bars?

Use a sharp knife and wipe the blade with a clean towel between each cut. For even cleaner edges, briefly warm the knife under hot water and dry before slicing. The parchment overhang makes lifting the entire block from the pan effortless.

→ Can I use dark chocolate instead?

Absolutely. Dark chocolate creates a bittersweet contrast that balances the sweet caramel beautifully. Use the same weight (10 oz) and melting method. The setting time remains identical regardless of chocolate type.

→ Do I need a candy thermometer?

While not strictly required, a thermometer ensures the caramel reaches proper consistency (225°F). Visual cues work too—look for a rich golden color and thickened texture that coats the back of a spoon. The mixture should bubble gently throughout cooking.

→ Why did my shortbread turn out hard?

Overbaking causes toughness. Remove the shortbread when just lightly golden at the edges—it continues cooking slightly from residual heat. Pressing the dough too firmly into the pan can also create dense results. Aim for even, gentle pressure when spreading.