Mix sugar, milk, butter, and cocoa powder in a saucepan over medium heat.
While you’re waiting for the mixture to boil, measure out the peanut butter and oats.
Bring the mixture to a boil and let it boil for 1 minute.
Remove the pan from the heat and immediately stir in oats and peanut butter. Then add in the vanilla, salt, and cinnamon.
Spread a large sheet of wax paper or parchment paper on the counter.
Using a tablespoon measure, place heaping spoonfuls a couple inches apart on the wax paper until you’ve used up all the mixture.
Let harden for a few hours, then place in a container and keep refrigerated until ready to eat.