Wait for a full boil: Start timing the 1 minute once the mixture is bubbling across the surface, not when you first see little bubbles around the edge of the saucepan.
Don't skip the cooling time: I know 8 to 10 minutes feels long when there's chocolate waiting to go in, but adding the chips and M&M's too soon will melt them into the oat mixture.
Use quick oats: I use quick or 1-minute oats because they soften enough for a no-bake cookie. Steel-cut oats won't work here, and old-fashioned rolled oats will give you a noticeably chewier texture.
Have everything ready: Once the mixture reaches the right stage, this recipe moves fairly quickly. Measure the peanut butter, oats, chocolate chips and M&M's before you start cooking.
Give them time to set: Leave the cookies alone until they've cooled and firmed up. Depending on the temperature of your kitchen, that can take close to an hour.
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