Preheat your oven to 350°F (175°C). This ensures that your cookies bake evenly and come out perfectly.
Line your baking sheets with parchment paper to prevent the cookies from sticking and to make cleanup easier.
In a large mixing bowl, combine the cubed unsalted butter, sugar, and brown sugar. Using an electric mixer, beat the mixture on medium speed until it is light and fluffy, about 2 to 3 minutes.
Chop the hard-boiled eggs into small pieces and add them to the butter-sugar mixture. Add the vanilla extract as well. Mix until everything is well incorporated.
In a separate bowl, whisk together the all-purpose flour, salt, and baking soda. This will ensure that your leavening agent is evenly distributed.
Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined. Be careful not to overmix, as this can make the cookies tough.
Using a spatula, gently fold in the semi-sweet chocolate chips and toffee bits until they are evenly distributed throughout the dough.
Using a cookie scoop or spoon, portion the cookie dough onto the prepared baking sheets. Leave some space between each scoop to allow for spreading while baking.
Place the baking sheets in the preheated oven and bake for 10 to 12 minutes, or until the edges are lightly golden. The centers may look slightly underbaked, but they will continue to cook as they cool.
Once baked, remove the cookies from the oven and let them cool on the baking sheets for about 5 minutes. Then, transfer them to a cooling rack to cool completely. Enjoy your Amazing Hard Boiled Egg Chocolate Chip Cookies with a glass of milk or your favorite beverage!