These chocolate toffee cookies are easy! I make them in a large bowl with an electric mixer, but use your stand mixer if you have it out. For the toffee, we use Heath Toffee bits, making these soft and chewy with just a touch of crunch. The cookies will spread out quite a bit during baking and are intentionally thin when fully baked.
8 tablespoons (113g) unsalted butter, softened
1/2 cup (100g) granulated sugar
1/2 cup (100g) brown sugar
1 teaspoon vanilla extract
1 large egg
1 cup (130g) all-purpose flour
1/4 cup (20g) unsweetened cocoa powder
1/2 teaspoon baking soda
1/4 teaspoon fine sea salt
1 cup (170g) toffee bits
Preheat the oven to 350°F (177°C). Line two cookie sheets with parchment paper or a silicon baking mat.
In a large bowl, use an electric hand blender to beat the butter and sugars together until light and fluffy, 2 to 3 minutes.
Add the egg and vanilla, then beat at medium speed until incorporated, 10 to 20 seconds.
Place a fine mesh sieve over the mixing bowl and sift in the flour, cocoa powder, baking soda, and salt. Then, use a spatula to stir everything together.
Stir in toffee bits.
Drop the cookie dough, a heaping tablespoon at a time, onto the baking sheets, placing them 2 inches apart so the cookies can spread in the oven. Bake until the tops look mostly dry, about 9 minutes.
Let cookies cool on baking sheets for 10 minutes, then transfer them to a cooling rack and cool completely. (The cookies will be soft but firm up as they cool.)