Heat butter and sugar to 300 degrees F: turn burner to medium low; add candy thermometer.
Stir regularly.
Line an 8in x 13in baking dish with parchment paper.
Remove pot from heat when thermometer reads 300 degrees F (hard crack).
Promptly pour into lined baking dish.
Allow the butter, sugar mixture to harden (let sit for about 5 minutes).
Sprinkle chocolate chips evenly over the warm butter base.
Cover the baking dish with tinfoil. Let sit for 5 minutes. The chocolate chips are melting.
Remove tinfoil. Spread the melted chocolate chips using a silicone spatula.
Refrigerate until completely cooled (about 60 minutes).
Break chocolate toffee into pieces and serve.
Notes
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