In large bowl, beat margarine and sugars until creamy. Add egg, banana, and vanilla. Beat well.

In a separate bowl, combine flour, baking soda, cinnamon and salt. Add to wet ingredients and mix well.

Add oats, mix well. Drop dough by rounded tablespoonfuls onto ungreased cookie sheets.

Bake 8 to 9 minutes for a chewy cookie or 10 to 11 minutes for a crisp cookie.

Cool 1 minute on cookie sheets; remove to wire rack. Cool completely.

Drizzle or spread each cookie with 1-2 teaspoons of Nutella. Serve and enjoy!