Homemade Chocolate and Crunchy Toffee Cookies — Grandma Barb’s Recipe

Some recipes stand the test of time. Not because they’re perfect on paper, but because they carry something with them — a smell, a memory, a hand that once wrote on a yellowed recipe card. This cookie recipe belongs to Grandma Barb, my husband’s grandmother. I never had the chance to meet her, but I was lucky enough to see her handwriting on an old-fashioned recipe card. There’s something really special about that.

We updated the recipe to include sourdough starter — because yes, even chocolate cookies can benefit from a little of that magic — and gave it a bit of a modern twist. The result: a cookie that’s soft, crunchy, caramel-y, and chocolatey. Basically everything you could ever want.

Why Make This Recipe?

Because these cookies are the real deal. The secret is the homemade crunchy toffee pieces. If you have the time to make them yourself, do it. The difference is genuinely unreal. The toffee melts into the cookie as it bakes and creates little crunchy, caramelized pockets — and combined with the semi-sweet chocolate chips already in the dough, the result is an absolutely wild combination. Caramel + chocolate in the same cookie should honestly be illegal.

That said, if you’re short on time, just use semi-sweet chocolate chips — still delicious. And if you want the best of both worlds without making the toffee from scratch, you can pick up Skor Bits at the grocery store. Fair warning though: they’re pretty pricey compared to making them at home. Either way, the recipe works great.

Role of the Ingredients

Unsalted butter (in the toffee): A neutral base that lets us control the salt level. We add it ourselves, which gives us a perfectly balanced salted caramel flavour.

Brown sugar: It shows up everywhere in this recipe — in the toffee AND in the cookies. It brings depth, warmth, and that subtle molasses flavour that makes cookies completely irresistible.

Sourdough starter: This is the updated twist. The starter adds a gentle acidity that balances the sweetness, and it contributes to the chewiness and slightly rustic texture of the cookie. It’s subtle, but it makes a real difference.

Rolled oats: They give the cookies body, chew, and that homey, old-fashioned character that feels just right for a grandma’s recipe. Don’t skip them.

Baking soda: For lift and that beautiful golden colour you get in the oven.

Semi-sweet chocolate chips: Pure dark chocolate would be too intense, and milk chocolate too sweet. Semi-sweet hits the perfect middle ground alongside the toffee.

Why This Recipe Is So Good

These cookies have EVERYTHING. The warmth of brown sugar, the crunch of toffee, the melt of chocolate, the chewiness from the sourdough starter, and the satisfying texture of rolled oats. These are cookies with personality. And then there’s the story behind them — a recipe card that’s travelled through generations, hands that made these cookies long before ours. That’s priceless.

Tips for Success

The Secret to Perfect Crunchy Toffee

Toffee takes a little love and patience, but it’s really not complicated if you follow a few key rules. First: never walk away from your pot. Toffee goes from perfect to burnt in seconds, so stay put and keep whisking. Second: use a heavy-bottomed saucepan — it distributes heat evenly and prevents hot spots that can burn the sugar too quickly. Third: don’t double the toffee recipe. Make two separate small batches if you need more — a larger batch takes longer to cook and is much harder to control. And finally, set everything up before you start: your baking sheet lined with parchment paper needs to be right beside you, because when that toffee hits temperature, you need to move fast. No time to go hunting for supplies.

Which Chocolate Chips Should You Use?

Chocolate isn’t just a mix-in here — it’s a main player. So it’s worth thinking about for a second. Semi-sweet chocolate chips are the classic choice and what I recommend: they have enough bitterness to balance the sweetness of the toffee and brown sugar without taking over. If you like more intense flavour, go for 70% dark chocolate chips — it makes for a more sophisticated, less sweet cookie that’s genuinely excellent. Milk chocolate, on the other hand, will make the whole thing very sweet — not my favourite with the toffee, but if that’s what you’ve got, it still works. What I’d steer clear of is low-quality chips that don’t melt well and leave a waxy taste once baked. Invest in good chocolate — Ghirardelli, Callebaut, or even the PC dark chips from the grocery store all do the job beautifully. You can taste the difference.

A Few More Tips

Make the toffee at 295°F – 305°F (147°C – 152°C): This is the sweet spot for hard, crunchy toffee. No thermometer? Watch and smell. You’re looking for a smooth, glossy mixture that’s turned a deep golden-brown with a rich, toasty caramel aroma filling your kitchen. That’s your cue.

Spread the toffee in a thin layer: The thinner the layer, the more delicate and melt-in-your-mouth the pieces will be in the cookie. Use a spatula or the back of a spoon on your parchment paper.

Rest the shaped cookies in the fridge for 15 to 30 minutes: This step is key. The cold firms up the butter, which keeps the cookies from spreading too much in the oven. You end up with a thicker, chewier cookie with a better centre.

Don’t overbake: 10 to 12 minutes at 325°F (163°C), that’s it. The cookies will still look a little underdone when they come out — that’s exactly what you want. Let them cool for 15 minutes on the pan so the under-baked centre can set up. That’s where the magic happens.

Cream the butter and brown sugar properly: Take the time to get a pale, slightly fluffy mixture. It incorporates air and gives you a lighter, more tender cookie.

Storage

These cookies keep at room temperature in an airtight container for 4 to 5 days. You can also freeze the raw dough balls on a baking sheet, then transfer them to a freezer bag. That way you’ve got fresh homemade cookies whenever you want — pull them out, pop them in the oven, and 15 minutes later you’re done. They keep in the freezer for up to 3 months.