I have made a few adjustments to make it my own over the years. It is a very easy recipe and fun for kids of all ages to make. Also very easy to tweak to fit your personal taste.
Step 1: Recipe
1/2 cup Peanut butter (creamy is the best to work with)
1 1/2 cup Sugar
1 tsp. vanilla extract
1/2 cup butter
1 cup flour
Preheat oven to 350 degrees. Mix all ingredients. DO NOT GREASE THE PAN. Bake in a 4 x 12x 2 pan for 25-30 minutes. Cut into squares.
Now as I have said before I have made some changes. They are:
1 cup chocolate chips
I bake in a 9 x 13 pan.
On other occasions I have also added melted chocolate and swirled it in, I have added all kinds of different nuts. Most anything is great mixed in it.
Step 2: Mixing
When mixed it is kind of thick, this is normal.
Just remember DO NOT GREASE THE PAN. There is enough oil with the butter and peanut butter that it will not stick to the pan.... just your hips hehe.
Step 3: Yummy.
I let mine cool for 15-20 minutes and then cut into squares.
I found that if i use a plastic knife to cut the squares, the bars cut smoothly and do not stick to the knife.