Preheat the oven to 350°F and line a baking sheet with parchment paper.
Cream the softened butter with the sugar or sweetener blend until smooth.
Mix in the Greek yogurt or sour cream.
Add the eggs and vanilla extract. Mix until combined.
Add the flour, protein powder, greens powder, instant matcha, baking powder, and salt.
Mix until a soft dough forms.
Fold in white chocolate chips, pistachios, or lemon zest if using.
Chill the dough for 20 to 30 minutes if it feels wet or too soft to scoop.
Scoop the dough onto the prepared baking sheet. Make 6 large cookies for a thick bakery-style texture.
Bake for 9 to 11 minutes, or until the edges are set and the tops look just cooked through.
Let the cookies cool on the pan for at least 10 minutes before moving. They will firm up as they cool.