Step 1

Combine sugar, cocoa powder, butter and milk in a medium saucepan over medium-high heat. Once it comes to a boil, start a timer and boil for 1 minute.

Step 2

Remove from the heat and stir in peanut butter and vanilla until smooth, then stir in oats.

Step 3

Drop heaping tablespoons onto a parchment paper–lined cookie sheet and let cool for at least 30 minutes before serving.