Preheat the oven to 350 degrees F.

Line two baking sheets with parchment paper.

In a separate bowl, whisk together the flour, oatmeal, baking powder and salt.

Set aside.

Cream together the butter and the white and brown sugars.

Add the eggs one at a time, making sure the first is thoroughly combined before adding the next.

Add the vanilla extract and the espresso powder.

Fold in the chocolate chips and the chopped pistachio nuts.

Use a spoon or cookie scoop to form the cookies and place on the baking sheets.

Bake for 10-12 minutes.

Remove from oven, transfer to a wire rack and let cool completely.