Pre-heat oven to 350. Grease cookie sheets or line with parchment paper.
In a mixer, combine all cookie ingredients except pecans. Beat at low speed scraping sides of bowl often, until well mixed (2-3 minutes). Stir in pecans. Shape rounded teaspoonfuls of dough into 1 inch balls.
Place 2″ apart onto prepared cookie sheets. Flatten cookie with bottom of a glass dipped in sugar.
Bake near center of oven for 12-15 minutes until edges are slightly golden brown. Remove from pan immediately. Cool completely on wire rack. Put cookies together in pairs with 1 tablespoon of frosting for each sandwich.
Frosting: In a mixing bowl, combine all frosting ingredients. Beat at medium speed, scraping sides of bowl often until light and fluffy (1-2 minutes).
Recipe by Sweet Dash of Sass at http://sweetdashofsass.com/2014/12/banana-cream-sandwich-cookies/