Preheat your oven to 350°F (175°C).

Line two baking sheets with parchment paper or reusable silicone baking mats. This helps prevent the cookies from sticking and promotes more even baking.

Measure all the ingredients before you begin. Place the flour, baking soda, salt, and optional cornstarch in a medium bowl. Whisk them together until evenly combined.

Preparing the dry ingredients separately helps distribute the baking soda and salt throughout the dough. This reduces the chance of uneven rising or salty spots in the finished cookies.

Make sure the baking sheets are cool before placing fresh cookie dough on them. Putting dough on a hot baking sheet can cause the butter to melt too quickly, resulting in cookies that spread excessively.

Step 2: Cream the Butter and Sugars

Place the softened butter, brown sugar, and granulated sugar in a large mixing bowl.

Using a hand mixer or stand mixer fitted with the paddle attachment, beat the ingredients for approximately 2–3 minutes, until the mixture looks creamy and well combined.

Scrape down the sides of the bowl as needed so that the butter and sugar mix evenly.

The butter should be soft enough to press gently with a finger but should not be melted. Melted butter changes the structure of the dough and may produce flatter cookies.

Creaming the butter and sugars helps create the texture of these chewy butterscotch toffee cookies. It also distributes the sugar evenly, helping the cookies bake consistently.

Step 3: Add the Egg, Egg Yolk, and Vanilla

Add the large egg, extra egg yolk, and vanilla extract to the creamed butter mixture.

Beat until the ingredients are fully incorporated and the mixture appears smooth.

The egg provides structure, while the additional yolk contributes richness and tenderness. Vanilla enhances the natural buttery sweetness and works especially well with the caramel flavor of the toffee bits.

If the mixture looks slightly separated at first, continue mixing briefly and scrape down the sides of the bowl. Avoid overbeating once the ingredients are combined.

Step 4: Combine the Wet and Dry Ingredients

Gradually add the flour mixture to the wet ingredients.

Mix on low speed or stir with a sturdy spatula until the flour is almost completely incorporated. Stop mixing once the dough comes together and no large patches of dry flour remain.

Avoid excessive mixing. Overworking the dough can develop gluten, which may make the cookies tougher rather than soft and tender.

The dough should be thick enough to scoop easily. If it feels unusually soft or warm, refrigerate it for approximately 20–30 minutes before adding the remaining ingredients or shaping the cookies.

Step 5: Fold in the Butterscotch Chips and Toffee Bits

Add the butterscotch chips and toffee bits to the cookie dough.

Use a spatula to fold them in gently until they are evenly distributed. If you are using chopped pecans, add them at this stage as well.

Try to distribute the chips and toffee pieces throughout the dough rather than allowing them to collect at the bottom of the bowl. This helps ensure that every cookie contains a delicious combination of buttery dough, sweet butterscotch, and crunchy toffee.

For a bakery-style appearance, reserve a small handful of butterscotch chips and toffee bits. Press a few pieces onto the tops of the dough balls just before baking.

Step 6: Chill the Cookie Dough

For thicker cookies with a richer flavor, cover the bowl and refrigerate the dough for approximately 30 minutes.

Chilling is optional, but it can help reduce excessive spreading and make the dough easier to handle. It also gives the flour time to absorb moisture, which can improve the cookie texture.

If you prefer thinner cookies with more spreading, you can bake the dough without chilling it, provided the butter has not become too warm.

For the most consistent results, keep the dough cool while working in batches. If the kitchen is particularly warm, return the dough to the refrigerator between batches.

Step 7: Shape the Cookies

Scoop the dough into portions approximately 1 1/2 tablespoons in size. Roll each portion gently into a ball and place it on the prepared baking sheet.

Leave approximately 2 inches between the dough balls to allow room for spreading.

Press a few reserved butterscotch chips or toffee bits onto the top of each dough ball if desired. This creates an attractive appearance and makes the ingredients visible after baking.

Avoid flattening the dough balls too much. The cookies will spread naturally in the oven, and leaving them slightly rounded helps maintain a soft center.

Step 8: Bake Until the Edges Are Golden

Place the baking sheet in the preheated oven and bake for approximately 9–12 minutes, depending on the size of the cookies and your oven.

The edges should look set and lightly golden, while the centers may still appear slightly soft. This is desirable because the cookies continue to firm up as they cool.

Do not wait until the centers look completely firm in the oven. Overbaking can make the cookies dry and reduce their chewy texture.

If your oven has hot spots, rotate the baking sheet halfway through the baking time. Bake one sheet at a time when possible for more consistent results.

Step 9: Allow the Cookies to Cool

Remove the baking sheet from the oven and allow the cookies to rest on the sheet for approximately 5 minutes.

During this time, the cookies continue to set, and the edges become firm enough to handle. The centers remain tender as the cookies cool.

Transfer them carefully to a wire rack to cool completely.

If the cookies appear slightly uneven after baking, you can gently shape the edges while they are still warm using a round cookie cutter or the rim of a heatproof glass. Move the cutter around each cookie in a small circular motion without pressing down on the top.

This optional technique creates neat, bakery-style cookies.

Step 10: Serve and Enjoy

Once the cookies have cooled enough to handle, arrange them on a serving plate.

For an extra-special finish, sprinkle a tiny amount of flaky sea salt over the cookies while they are still slightly warm. The salt enhances the caramel flavor and balances the sweetness of the butterscotch chips.

Serve these homemade Butterscotch Toffee Cookies with cold milk, coffee, tea, or hot chocolate.

Enjoy the combination of soft cookie centers, lightly crisp edges, sweet butterscotch chips, and crunchy toffee bits in every bite.