Preheat the oven to 350°F.
Line a baking sheet with parchment paper.
Combine the oats, flour, sugar, baking powder, baking soda and salt in a large bowl.
In a separate bowl combine the honey, oil, vanilla extract and molasses. Add the wet ingredients to the dry ingredients and stir to combine. Fold in the dried plums and nuts.
Using your hands, roll tablespoon size scoops of dough into balls.
Place the balls onto the prepared baking sheet, and press down slightly on the balls to flatten the tops.
Bake for 8 to 12 minutes or until lightly browned. Transfer cookies to a baking rack to cool completely.
For variety, replace the all-purpose flour with whole wheat pastry flour, barley flour, spelt flour, or gluten-free baking mix (choose on that does not include baking soda and powder). You can also substitute chocolate chips for the dried fruit and any kind of nuts for the walnuts.