Whisk together the flour, baking powder, and salt in a mixing bowl.
In another mixing bowl, whisk together the sugar, Greek yogurt, milk, melted butter, eggs, and vanilla extract.
Add the dry ingredients to the wet and mix until just combined using a rubber spatula.
Grease a mini muffin tin with cooking spray.
Distribute the batter into the mini muffin tin, using 1 tablespoon of batter per tin (it should fill it about half way).
Top the batter with 2-3 fresh blueberries on top or a sprinkle of mini chocolate chips.
Bake the mini muffins at 400 degrees for 9-11 minutes, or until a toothpick inserted comes out clean.