Creating Irresistible Pistachio Cream Cookies is an enjoyable process. Follow these easy steps to bake your cookies:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C). Prepare a baking sheet by lining it with parchment paper.

1. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar together until light and fluffy, about 3-5 minutes.

1. Add Egg and Vanilla: Mix in the egg and vanilla extract, ensuring everything is well combined.

1. Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, and salt.

1. Incorporate Dry Ingredients: Gradually add the dry mixture into the wet ingredients, mixing until just combined. Do not over-mix.

1. Stir in Pistachios: Gently fold in the finely chopped pistachios until evenly distributed throughout the dough.

1. Shape Cookies: Using a tablespoon or cookie scoop, portion out the dough and roll it into balls. Place them onto the prepared baking sheet, leaving space between each cookie.

1. Bake: Bake in the preheated oven for 12-15 minutes, or until the edges are lightly golden. The center should still be soft.

1. Cool Cookies: Remove from the oven and let the cookies cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely.

1. Prepare Pistachio Cream Filling: In a separate bowl, whip the heavy cream with the powdered sugar until stiff peaks form.

1. Assemble Cookies: Once the cookies have cooled, take a generous spoonful of the whipped cream and sandwich it between two cookies.

1. Garnish: Optionally, sprinkle additional finely chopped pistachios on the edges for a decorative touch.