Choose a pan with dimensions of 6x3.5 inches and place a sheet of parchment paper.
In a saucepan, add the vanilla extract and peanut butter. The mixture should be heated Stir occasionally to prevent it from sticking or burning over low heat.
Now in another saucepan, add the water and sugar. Over medium heat, bring the mixture to a boil. Monitor the syrup's temperature with a candy thermometer. A temperature of 257°F is the target.
Once the syrup reaches the required temperature, remove it from the heat and quickly pour in the hot peanut butter. Stir the peanut butter into the syrup using a spoon.
The peanut butter and syrup are mixed, pour the mixture into the prepared pan swiftly. Act fast because it will harden quickly.
Cool the mixture for 5 to 10 minutes before cutting it into bars.
Notes
Use a candy thermometer for precise temperature control.
Choose high-quality smooth peanut butter for the best texture.
Allow the candy to cool before cutting it into bars for clean and neat pieces.