Preheat oven to 350 degrees. Line a cookie sheet with parchment paper and set it aside.
Brown butter in small saucepan and allow to boil for a couple minutes. Remove from heat.
In mixer, beat melted butter with brown sugar for 3-4 minutes. Add eggs. Beat in vanilla. Slowly beat in flour, salt, baking soda and baking powder. Fold in the cashews and toffee bits.
Use a 2 Tablespoon cookie scoop to drop cookie dough onto parchment paper lined cookie sheet. Tap tops with fork or press with thumb, lightly.
Bake for about 12-14 minutes. Remove and enjoy.
Notes
While it’s not difficult to brown butter, you want to be careful not to burn the butter by accident.
To prevent this, I recommend using a pan with a lighter colored bottom so you can monitor the color of the butter better.
You’ll know the butter is ready when it turns a dark golden brown and smells nutty. When this happens, remove the butter from heat right away to avoid overcooking.
This usually occurs after about 2-3 minutes of boiling over medium heat on my stove.