Preheat oven to 190℃ and line a baking sheet with parchment paper or a silpat mat.
In a large bowl whisk together the flour, flax meal, dry milk powder, baking soda, baking powder, salt, cinnamon, and allspice.
In the bowl of a stand mixer or with a handheld mixer beat together the softened butter, maple syrup, applesauce, Greek yogurt, and vanilla extract. Slowly add in the dry ingredients beating until combined. With a rubber spatula, fold in the oats and diced prunes.
Using a 2 inch cookie scoop, scoop out balls of the dough and place them about 2 inches apart from each other on the prepared baking sheet. Bake the cookies on the middle rack of the oven for 10-12 minutes or until set and golden around the edges. Cool on a wire rack and store in an airtight container or freeze them.
