Set your oven to 350°F (175°C) and prepare a muffin tin with paper liners.
Combine the flour, baking powder, sugar, and salt in a large mixing bowl and whisk together.
In another bowl, beat eggs, milk, and melted butter. Add almond extract.
Gradually combine wet and dry ingredients until just mixed. Do not overmix.
Gently stir in the chopped pistachios, and add chocolate chips if you’re including them.
Divide batter evenly into muffin cups.
Place the muffins in the oven and bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean.
Cool before serving.
