Chocolate Pretzel Toffee

1. Preheat the oven to 350° F. Line a 9x13 inch baking pan with parchment paper. Arrange the pretzels in an even layer in the pan.
2. Melt together the butter, brown sugar, and cream in a pot set over medium heat. Bring to a boil and cook until the mixture is bubbling, about 4 minutes. Remove from the heat, stir in the vanilla. Pour the sauce over the pretzels. Bake for 5 minutes, until the sauce is baked onto the pretzels.  
3. Sprinkle with chocolate chips and bake for another 1 minute to melt. Spread the chocolate evenly, top with peanuts, and then sea salt. 
4. Freeze or chill for 1 hour or until set. Break into small pieces for serving.