1Heat oven to 350 degrees
In large mixing bowl, combine 1c sugar, butter, banana and vanilla.
Beat at medium speed until light and fluffy.
Beat at low speed until soft dough forms.
Stir in peanuts
2Shape dough into 1 inch balls.
Place balls 2 inches apart on ungreased cookie sheet.
Flatten balls to 2 inches diameter circles using the bottom of a drinking glass, dipping glass in sugar to prevent sticking.
3Bake for 12 to 15 minutes or until golden brown.
4In medium mixing bowl, combine filling ingredients
Beat at low speed until smooth.
Spread about 2 teaspoons filling on bottom of half the cookies.
Gently press the bottoms of remaining cookies against filling to form sandwiches.