Preheat the oven to 450F and line a muffin pan with parchment liners or grease each well with non-stick cooking spray. Set aside.
In a medium bowl, sift together 1½ cups of the flour, baking soda, baking powder, and salt. Set aside.
In a large bowl, cream together the butter and sugar, then mix in the eggs, Greek yogurt, and vanilla extract.
Gently fold the dry ingredients into the wet ingredients, the batter will be lumpy, do not over mix. Fold the chocolate chips into the batter.
Divide batter evenly between each muffin liner and top with additional mini chocolate chips and coarse sugar, if desired.
REDUCE HEAT TO 375F DEGREES and bake for 12 to 16 minutes or until the muffin tops are golden brown and an inserted toothpick comes out clean from the center of the muffins. You can alternatively preheat the oven to 375F and bake for 20 to 22 minutes.
Allow muffins to cool in the pan for several minutes before removing and enjoying.