Bring to boil:

1/2 cup peanut butter
1/2 cup brown sugar
1/2 cup corn syrup
1 Tbsp.. butter
1 tsp. vanilla

Remove from heat and add:

2 cups Rice Krispies
1 cup slightly chopped, Spanish peanuts

Press into greased 8 inch pan, cool, and top with:

1/2 cup chocolate chips (melted)