01 - Preheat the oven to 350°F. Line a 12-cup muffin pan with paper liners.
02 - Place pistachios in a food processor and pulse until finely ground, being careful not to over-process into a paste.
03 - In a medium bowl, whisk together the ground pistachios, flour, baking powder, baking soda, and salt until well blended.
04 - In a large bowl, beat the softened butter and sugar until light and fluffy. Add eggs one at a time, beating thoroughly after each addition.
05 - Blend in the yogurt, milk, vanilla extract, and almond extract. Add green food coloring if a vibrant green color is desired.
06 - Gently fold the dry ingredients into the wet mixture until just combined. Avoid overmixing to ensure tender muffins.
07 - Divide the batter evenly among the muffin cups, filling each about three-quarters full.
08 - Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean. Allow muffins to cool in the pan for 5 minutes before transferring to a wire rack.
09 - Whisk together powdered sugar, milk, and vanilla extract until smooth and pourable. Drizzle over cooled muffins and top with chopped pistachios.