In a mixing bowl, whisk the eggs and sugar with an electric cake mixer until you obtain a smooth and fluffy texture.
Add the melted butter, pumpkin puree, cinnamon, yogurt, vanilla extract, pumpkin spice and mix well for approximately 30 seconds until everything is well combined.
Add the flour, salt, baking powder and mix for another 30-45 seconds on medium-high speed.
Remove and fold in 1 cup of the mini chocolate chips.
Fill the muffin pan liners with the finished batter (usually a full ice cream scoop should do it, unless you have bigger muffin pan) and top with mini chocolate chips.
Bake muffins on 350 degrees for 25-35 minutes, or until you insert a tooth pick into the center and it comes out clean.
Serve and enjoy.