In a medium saucepan, combine 1 cup granulated sugar and 1/2 cup unsweetened cocoa powder.

Add 1/2 cup unsalted butter and 1/2 cup milk to the saucepan and stir over medium heat until melted and smooth.

Increase heat to medium-high and bring the mixture to a rolling boil.

Boil for exactly 1 minute without stirring to activate the sugars.

Remove the saucepan from heat and let the mixture cool for 2 minutes.

Stir in 2 cups old-fashioned oats and 1/2 cup creamy peanut butter until well combined.

Mix in 1 teaspoon vanilla extract and a pinch of salt to balance the sweetness.

Drop spoonfuls of the mixture onto a parchment-lined cookie sheet and let cookies cool and set for at least 30 minutes.