Melt the butter with marshmallows, peanut butter and brown sugar

• Put the butter, marshmallows, smooth peanut butter and brown sugar in a saucepan over low heat.
• Stir constantly until everything is smooth and fully combined.

Finish the base

• Turn off the heat.
• Stir in the vanilla extract and a touch of freshly ground sea salt.

Fold in the Cheez-Its

• Add the Cheez-It crackers to the pan, starting with about half and adding the rest.
• Fold gently until the crackers are well coated.

Spread into the dish

• Scrape the mixture into a baking dish with the spatula.
• Smooth the top out evenly; broken crackers are fine.

Top with chocolate chips and peanut butter drizzle

• Scatter mini chocolate chips over the top so they stick.
• Drizzle with a little melted peanut butter.

Chill to set

• Refrigerate until firm, then cut into pieces.