Start by lining a baking sheet with parchment paper. This will prevent the toffee from sticking and make cleanup a breeze.
In a heavy-bottomed saucepan over medium heat, combine 1 cup of real butter and 1 cup of sugar. Stir constantly until the mixture comes to a boil.
Once boiling, reduce the heat slightly and add 1 tsp of pure vanilla extract. Continue to stir for about 5-7 minutes, or until the mixture turns a light golden brown.
Remove the saucepan from heat and stir in 2 cups of roasted sea salt peanuts. Mix well until the peanuts are fully coated with the buttery sugar mixture.
Pour the peanut mixture onto the prepared baking sheet. Use a spatula to spread it evenly and ensure it fills the entire pan.
In a microwave-safe bowl, melt 1 bag of semi-sweet chocolate chips in 30-second intervals, stirring in between until smooth.
Pour the melted chocolate over the peanut toffee mixture. Use a spatula to spread it evenly across the top.
Allow the toffee to cool at room temperature, or place it in the refrigerator to speed up the setting process. Once set, break it into pieces.