No-Bake Peanut Butter Bars

Line an 8-by-8-inch baking pan with 8-inch-wide strips of parchment paper or foil so that all sides are covered with a 1-inch overhang on all sides. Lightly grease with butter; set aside.

In a large cast iron, carbon steel, or nonstick skillet, toast oats over medium heat, stirring occasionally, until lightly golden and fragrant, about 5 minutes. Set aside and let cool slightly.

In a large saucepan, melt butter, peanut butter, honey, and marshmallows over low heat, stirring frequently, until melted, about 5 minutes. Add honey, salt, and vanilla, stirring to incorporate. Add oats and stir to combine.

Using a flexible spatula, scrape mixture into a large bowl. Let cool slightly, about 3 minutes, then fold in peanuts and chocolate chips. Scrape mixture into prepared baking pan. Spread into an even layer, then use a flat-bottomed drinking glass or measuring cup to compress firmly until oat mixture is in a compact, even layer across bottom and sides of pan. Let sit until firm, about 8 hours.

Lift foil overhang to remove bars onto cutting board. Using a sharp knife, portion oat bars into 12 squares.