Best Toffee Ever

Spray a 9 square baking pan with cooking spray and line with parchment paper.

Spread the chopped nuts in a single layer on the parchment paper.

Add butter, sugar, and salt to a heavy-bottomed 3-quart pot. Bring to a boil over medium heat, stirring frequently to dissolve sugar.

Once candy is boiling, stir occasionally, slowly and smoothly, until candy reaches 290-300 degrees (hard crack stage) on candy thermometer.

Remove candy from heat and gently add vanilla.

Carefully pour candy over chopped nuts. Allow to sit undisturbed for a few minutes before sprinkling chocolate chips over top.

Cover baking pan with aluminum foil and let rest for about 5 minutes to soften chips.

Remove foil and spread softened chocolate evenly over candy. Refrigerate until set, about 2 hours.

Remove parchment from pan and, using a sharp knife, break candy into medium-sized pieces. Store in an airtight container in a cool place.