Step 1: Preheat the Oven

1. Preheat your oven to 350°F (175°C).

2. Line baking sheets with parchment paper or silicone baking mats.

Step 2: Cream the Butter and Sugars

1. In a large bowl, cream together softened butter, brown sugar, and granulated sugar until light and fluffy.

2. Add in the pudding mix and blend until fully incorporated.

Step 3: Add Eggs and Vanilla

1. Beat in the eggs, one at a time.

2. Stir in the vanilla extract and mix until smooth.

Step 4: Mix the Dry Ingredients

1. In a separate bowl, whisk together flour, baking soda, and salt.

2. Gradually add the dry ingredients to the wet mixture, mixing just until combined.

Step 5: Fold in Pistachios and Optional Add-ins

1. Gently fold in the chopped pistachios and white chocolate chips if using.

2. Do not overmix—just enough to distribute evenly.

Step 6: Scoop and Bake

1. Use a cookie scoop to drop dough onto the prepared baking sheets, spacing about 2 inches apart.

2. Bake for 10-12 minutes, or until the edges are set and the centers are still slightly soft.

3. Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.

Step 7: Garnish and Serve

1. Once cooled, drizzle with melted white chocolate or sprinkle with powdered sugar if desired.

2. Serve with a glass of milk or a warm cup of tea.