Preheat your oven to 375°F. Line baking sheets with parchment paper and set aside.
In the body of a stand mixer with the paddle attachment, cream the butter, shortening, and brown sugar until light and fluffy. 2 minutes.
Add the egg, milk and vanilla and mix well.
Add the oats, all-purpose flour, and whole wheat flour along with the baking soda, salt, cinnamon, and nutmeg and mix until combined.
Add the dried blueberries and mix until incorporated.
Drop tablespoonfuls (I like to use 1 tablespoon-sized cookie scoop for this) of the cookie batter onto the lined baking sheets, 2 inches apart, and bake for 10-12 minutes or until the cookies become light golden around the edges.
Remove from the oven and let them rest for 1 minute before removing to a cooling rack. Serve warm or let cool completely before storing.
Notes
Make sure you are using old fashioned oats.
Fresh blueberries will not work for this recipe.
We do use a food processor for this recipe, we have not tried another method.
This makes a large batch, you can halve if you'd like.