Remove butter from the fridge and place in microwaveable bowl. Melt completely for 1 to 2 minutes. Be sure to cover the top to prevent the butter from popping.
Add the brown sugar and turbinado sugar to the melted butter. Beat until combined.
Mix in the egg, egg yolk, milk and vanilla into the butter sugar mixture.
Next, add in the all purpose flour, bread flour, baking soda, salt and baking powder. Mix until thoroughly combined.
Gently fold in the chopped pecans and toffee bits into the cookie dough.
Cover a cookie sheet with aluminum foil. Scoop a spoonful of dough onto the cookie sheet. Next, place another scoop of dough ON TOP of the first scoop, to create a double scooped cookie. Continue until your cookie sheet is full with about 2-3" between each cookie.
Place baking tray with cookies into the fridge to chill for at at least 30 minutes.
Part way through the chilling process, preheat the oven to 375°.
Remove the baking tray from the fridge and place in warmed oven. Set the timer for 6 minutes.
Following the 6 minutes, open the oven and turn the baking tray, to allow the cookies to cook evenly. Bake for another 6 minutes.
Remove the gently browned cookies from the oven. Allow them to cool on the tray for at least 10 minutes.
Repeat for any remaining cookie dough.
Enjoy!
Notes
Cookies can be stored at room temperature for up to 5 days.