Preheat oven to 375° and prepare a cookie sheet with parchment paper or silicone stick mat.
In a mixing bowl combine butter and apple sauce and beat with an electric mixer until creamed together. Add sugar, bananas, eggs and vanilla and continue to beat on medium speed until smooth.
Gradually add flour and baking soda and beat until fully combined.
Stir in oats, chocolate chips and nuts until incorporated. By now the batter is nice and thick and your arms will start to get tired ??!
Drop dough onto the prepared baking sheet with cookie scoop or spoon. These will rise and spread so give each one some room.
Bake for 10 to 14 minutes or until golden brown around the edges. Transfer to a wire rack to cool.