01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with cooking spray.
02 - In a large bowl, whisk together the flour, ground pistachios, sugar, baking powder, baking soda, and salt until well blended.
03 - In a separate bowl, beat the eggs until lightly frothy. Whisk in the milk, Greek yogurt, melted butter, vanilla extract, and almond extract if using.
04 - Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined. The batter should remain slightly lumpy. Add green food coloring drop by drop if desired and fold to distribute evenly.
05 - Divide the batter evenly among the 12 prepared muffin cups, filling each about three-quarters full. Sprinkle chopped pistachios over the top of each muffin.
06 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
07 - Let the muffins cool in the tin for 5 minutes. Transfer to a wire rack and cool completely before serving.