Butter a 9x13 sheet pan and set aside.
Start by browning the butter. In a deep pot set on medium heat, add the butter and allow it to melt and turn golden brown. About 2-3 minutes. Stir the butter constantly until the butter smells toasted.
Once the butter is ready, turn the heat down to low and add in the caramel bits. Stir the caramel until melted.
Add marshmallows into the pot and mix with the brown butter caramel until everything is melted together.
In a large mixing bowl, add the puffed rice cereal and pour the marshmallow mixture over top. Toss this gently and mix well.
Working quickly, evenly press the rice crispy mixture into the buttered pan. This will be sticky so using a rubber spatula helps.
Top the warm rice crispies with candy corn and peanuts and press the toppings down gently. Sprinkle with a touch of sea salt to finish it off!
For serving, wait about 30 minutes before cutting so everything holds together. For larger rice crispies, cut into 12 squares or for a more manageable sized treat divide the 12 into 24 squares.