1-Getting Started: First, gather and measure all ingredients precisely. Ensuring the egg is at room temperature helps it incorporate better into the dough. If you are using vegan alternatives, prepare those as directed on the packaging before starting.

2-Getting Started: Second, cream the softened butter and sugar together. You want to beat this mixture until it is light and fluffy. This step incorporates air into the dough, which helps with the texture. Using an electric mixer makes this easy, but a sturdy spoon and some elbow grease work too.

3-Mixing the Dough: Third, add the vanilla extract and the room temperature egg to the butter mixture. Mix well until everything is combined and smooth.

4-Mixing the Dough: Fourth, it is time to add the dry ingredients. Stir in the 2½ cups of flour gradually. You want to mix until the flour is fully incorporated. If the dough feels too dry or crumbly, add water one teaspoon at a time until it holds together nicely. Do not overmix, or the cookies might get tough.

5-Mixing the Dough: Fifth, gently fold in the toffee bits. You want them evenly distributed so every cookie has those delicious crunchy pockets. For a different twist, you could use chocolate chips here, but the toffee really gives this recipe its signature flavor profile.

6-Shaping and Chilling: Sixth, divide the dough in half. Shape each half into a log approximately 6 inches long and 1.5 inches in diameter. This size ensures uniform baking. Wrap each log tightly in plastic wrap.

7-Shaping and Chilling: Seventh, refrigerate the logs for 1 to 2 hours until they are firm. This step is crucial. If the dough is too warm, the cookies will spread too much in the oven and lose their shape. You can also leave them in the fridge overnight if you want to bake them fresh the next morning.

8-Baking to Perfection: Eighth, preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper. This prevents sticking and makes cleanup a breeze.

9-Baking to Perfection: Ninth, unwrap the chilled dough logs. Slice the dough into ¼ inch slices. Place the slices on the prepared baking sheet about 2 inches apart. They will spread a little bit, so giving them space is important.

10-Baking to Perfection: Tenth, bake for 8 minutes or until the edges are lightly browned. Keep a close eye on them at the end, as toffee can burn quickly. The centers should still look slightly soft as they will continue to cook on the hot pan after you take them out.

11-Baking to Perfection: Finally, allow the cookies to cool on the baking sheet for 5 minutes. This sets the structure. Then, transfer them to a wire rack to cool completely. Enjoy them warm for the ultimate gooey experience!