1. Preheat oven to 350°. Stir together first 4 ingredients in a medium bowl. Beat butter, brown sugar, and vanilla at medium speed with an electric mixer 3 to 5 minutes or until creamy. Add eggs, 1 at a time, beating well after each addition. Add flour mixture and banana; beat just until blended. Add oats and next 2 ingredients; stir until blended.
2. Drop dough by heaping tablespoonfuls 2 inches apart onto 2 parchment paper-lined baking sheets. Flatten each, using a lightly floured flat-bottom glass.
3. Bake at 350° for 12 minutes or until golden. Cool on baking sheets 10 minutes; transfer to wire racks, and cool.
4. Spread Cream Cheese Frosting over half of each cookie (about 1 1/2 tsp. per cookie); sprinkle with banana chips, coconut, and pecans, pressing to adhere.