Step 1

Butter an 8 x 8" baking dish or any dish of similar size. I used a pie plate for this photo. Have all ingredients measured out before starting since you'll be stirring constantly once you start.

Step 2

In a saucepan over MEDIUM heat, bring the sugar and milk to a boil, stirring constantly. Once it's bubbling all over, boil for EXACTLY 2 1/2 minutes. (I set the timer on the microwave. Really.)

Step 3

Remove from heat. Stir in the vanilla extract. Then stir in the peanut butter. Blend well, but quickly, until smooth.

Step 4

Pour into buttered dish and smooth out. Cool before cutting into pieces.