In a saucepan melt your butter and whisk in brown sugar and vanilla till combined and bubbling.
Add your pretzels to a bowl or directly to sheet pan, add your butter mixture on top and stir together to coat all of the pretzels.
Add your toffee bits, chocolate chips, and a sprinkle of Parmesan on top and bake on 350 for 6-8 minutes until most chocolate is melted
Top with more Parmesan (optional: but highly recommend) and serve or store!