Whisk together the flour, baking powder, baking soda and 3/4 cup of mini chocolate chips in a medium bowl.
In a separate large bowl, whisk together the eggs and greek yogurt until completely smooth and no yellow streaks from the eggs remain. Then mix in the vanilla, maple syrup and melted butter.
Add the dry ingredients to the our the wet ingredients in one addition. Use a rubber spatula or wooden spoon to gently stir to combine, stopping right when it’s combined. Do not over mix.
Set the batter aside and let it rest for at least 15 minutes or up to 1 hour. This helps the starch molecules in the flour absorb the liquid, giving the batter a thicker consistency. You can also cover the batter with plastic wrap and put it in the fridge overnight to bake the next morning.
While they’re resting, preheat the oven to 425°F. Line a mini muffin tin with mini muffin liners and spray them with non stick spray.
When you’re ready to bake, use a mini scoop or tablespoon to gently run the spoon through the batter, trying not to knock out any of the air from resting. Overfill each liner slightly so the batter is just above the edge line of the tin.
Top each muffin with the remaining mini chocolate chips and sprinkle on coarse sugar, if desired. Bake in the preheated oven for 2-3 minutes then lower the temperature to 350°F, with the muffins still in the oven, and finish baking for 9-10 more minutes, or until the tops are set and the edges are slightly golden brown.