Preheat oven to 350 degrees and prepare a baking sheet with parchment paper.
In a medium bowl, whisk together flour, baking soda, baking powder, and salt. Set aside.
In a mixer fitted with a paddle attachment, combine butter and sugars on medium speed until light and fluffy (about 2 minutes).
Add egg and vanilla extract and mix until combined.
Add dry ingredients on low speed and mix until just incorporated. Do NOT overmix!
Add toffee bits.
Using a medium ice cream scoop (about 1 3/4" in diameter) scoop cookies onto parchment.
Bake for 8-10 minutes, or until the edges just begin to turn golden.