Stir until the mixture starts to boil. Boil the mixture for 1 minute and then remove the saucepan from the heat.

Add the peanut butter and vanilla extract. Stir to combine, until the peanut butter has melted and the mixture is smooth.

Stir in the oatmeal and salt.

Line a baking sheet or cutting board with parchment paper.

Use a spoon or a cookie scoop, to scoop the batter onto the prepared baking sheet, forming the cookies. Flatten the cookies to the desired thickness using the back of the spoon.

Let the cookies sit at room temperature for 30 minutes, or chill them in the fridge for about 15 minutes until hardened.