In a large bowl, using a handheld mixer, mix cookie mix, pudding, and flour.
Add melted butter and eggs and mix until incorporated.
Fold in pistachios and chocolate chips and mix well.
Portion out dough using a medium cookie scoop then roll into a ball to tighten the cookies up (the dough is chunky so if you skip this step, the cookies will break apart while they bake). Arrange on parchment-lined cookie sheet, 2 inches apart.
Bake for 7-9 minutes. Don't over bake them! If you bake them too long you will lose the soft texture and they won't be as green. They will not brown. Cool on pan 2 minutes.
Transfer to a baking rack and coo. Store in an airtight container.
Notes
Dry Ingredients: You’ll want to mix your dry ingredients together first. This ensures even dispersion and helps with emulsification too.
Over Mixing: Mix just until ingredients come together. Over mixing strengthens gluten which can make your cookies tough.
Over-baking: It's important not to over-bake your cookies. Place them 2 inches apart on the cookie sheet for proper air circulation and bake them until the center is set.
When Are They Done: They probably won’t look done, but you’ll want to leave them on the cookie sheet for a couple of minutes when they come out of the oven. They’ll continue cooking a little, but they’ll stay soft and chewy on the inside.